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Old 05-26-2008, 02:40 PM   #1
loner42
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Default List of Reference Dimensions for AK Barrels and Their Components

The following is a list of reference dimensions for barrel and barrel components for those of you who want to use different components and different barrels on your builds.
All measurements were made as accurately as possible and should fall within + or - .001
.Some were made on stripped barrels and components and some were made on assembled rifles as I did’nt want to dismantle them just for measurements.Some were unobtainable,( as in not enough area to measure )All were taken from my personal rifles and kits. I will add to and update this list as I can and intend to post it on as many gunboard BIY forums as possible.

If you have suggestions for other dimensions related to the barrel group feel free to throw it out there. I've spent about 3 days on this and typed it all out on Word, and then copied and pasted it here and everything went to Shit. I had everything in nice straight columns and as soon as i pasted it to the reply box, everything went all Mumbo Jumbo.............. For the life of me i cannot figure out how to get everything back into straight columns and i'm tired of Muckin with it. So if anyone knows how, and is willin to straighten this up and make it look a little more professional, be my guest.
Here we go and happy building………………

BARREL OVERALL LENGTH

SAIGA .223………………………………………………………………………………………........16 Ό
SAIGA .308……………………………………………………………………………………….........16 Ό
BULGARIAN 5.45 AK-74………………………………………………………………………......16 Ό
MAADI 7.62X39…………………………………………………………………………………......16 1/2
HUNGARIAN SA2000M 7.62X39………………………………………………………………...16 1/4
HUNGARIAN AMD 65 ………………………………………………………………………….........12 ½
HUNGARIAN AMD 63…………………………………………………………………………..........16 ½
ROMANIAN G …………………………………………………………………………………........... 16 Ό
YUGOSLAVIAN AB2…………………………………………………………………………….......16 Ό
YUGOSLAVIAN VIRGIN KRINK………………………………………………………………..........10
YUGOSLAVIAN M72 RPK……………………………………………………………………….......21 Ό
RUSSIAN MILLED AK-47……………………………………………………………………….......16 Ό
ROB. ARMS VEPR 7.62X39……………………………………………………………………....16 5/8
POLISH U/F 7.62X39…………………………………………………………………………….....16 Ό
POLISH TANTAL 5.45X39……………………………………………………………………....16 5/8
MAK 90 7.62X39 U/F……………………………………………………………………………......16 ½
MILLED TYPE 56 7.62X39………………………………………………………………………....16 Ό


CHAMBER OUTSIDE DIAMETER

SAIGA .223……………………………………………………………… ………………………..........N/A
SAIGA .308……………………………………………………………………………………......... .. 986
BULGARIAN 5.45 AK-74………………………………………………………………………........ N/A
MAADI 7.62X39…………………………………………………………………………………......... N/A
HUNGARIAN SA2000M 7.62X39………………………………………………………………...... N/A
HUNGARIAN AMD 65 ………………………………………………………………………......... .908
HUNGARIAN AMD 63…………………………………………………………………………......... .908
ROMANIAN G …………………………………………………………………………………........... .908
YUGOSLAVIAN AB2……………………………………………………………………….......... .908
YUGOSLAVIAN VIRGIN KRINK……………………………………………………………........ .908
YUGOSLAVIAN M72 RPK……………………………………………………………………........ .908
RUSSIAN MILLED AK-47………………………………………………………………………........ N/A
ROB. ARMS VEPR 7.62X39……………………………………………………………………...... .908
POLISH U/F 7.62X39…………………………………………………………………………...... .908
POLISH TANTAL 5.45X39…………………………………………………………………...... .908
MAK 90 7.62X39 U/F…………………………………………………………………………....... .762
MILLED TYPE 56 7.62X39……………………………………..……………………………...... N/A



MUZZLE THREAD / THREAD LENGTH



SAIGA .223………….......................................... .................................N/A
SAIGA .308…………………………………………………………………………………............... .N/A
BULGARIAN 5.45 AK-74……M24 X 1.5 RH…………………………………………....... .780
MAADI 7.62X39…………………………………………………………………………….............. N/A
HUNGARIAN SA2000M 7.62X39………………………………… ………………………......... N/A
HUNGARIAN AMD 65 …………M14 X 1 LH………………………………………….......... .610
HUNGARIAN AMD 63…………M14 X 1 LH………………………………………….......... .570
ROMANIAN G …………………M14 X 1 LH…………………………………………............. .560
YUGOSLAVIAN AB2…………M14 X 1 LH………………………………………….......... .560
YUGOSLAVIAN VIRGIN KRINK………M26 X 1.5 LH……………………………… ........ .700
YUGOSLAVIAN M72 RPK……………M14 X 1 LH…………………………. ………......... .580
RUSSIAN MILLED AK-47…………M14 X 1 LH…………………………………….......... .560
ROB. ARMS VEPR 7.62X39… NO THREADS .614 DIA…………………………... .500
POLISH U/F 7.62X39……………M14 X 1 LH………………………………………........ .590
POLISH TANTAL 5.45X39……M14 X 1 LH…………………………………………...... 1.500
MAK 90 7.62X39 U/F………THREADS TURNED OFF .530 DIA……………….... .640
MILLED TYPE 56 7.62X39……M14 X 1 LH………………………………………….. ......570


BARREL DIA. FOR GAS BLOCK / G.B. OVERALL LENGTH


SAIGA .223……….................... 631 ……………..................................1.410
SAIGA .308…………….............. .712 ………………………………………………...... 1.400
BULGARIAN 5.45 AK-74…….......592 . ……………………………………………...... 1.425
MAADI 7.62X39……………......... .592 ……………………………………………...... 1.060
HUNGARIAN SA2000M 7.62X39 ..591 ……………………………………………...... 1.050
HUNGARIAN AMD 65 ………….......592 …………………………………………… ......1.060
HUNGARIAN AMD 63……………......592 ……………………………………………. ......1.060
ROMANIAN G …………………..........592 ……………………………………………... .....1.065
YUGOSLAVIAN AB2……………......631 ……………………………………………. ....1.540
YUGOSLAVIAN VIRGIN KRINK......591 ……………………………………………...... 1.665
YUGOSLAVIAN M72 RPK………. .808 ……………………………………………...... 1.440
RUSSIAN MILLED AK-47……….. .631 ……………………………………………..... 1.450
ROB. ARMS VEPR 7.62X39……… .790 …………………………………………….... .. 1.060
POLISH U/F 7.62X39……………. .592 …………………………………………….. ... 1.060
POLISH TANTAL 5.45X39……… .580 ……………………………… ……………...... 2.070
MAK 90 7.62X39 U/F…………….. .631 ……………………………………………... . ..1.350
MILLED TYPE 56 7.62X39……… .631 ………………………………. …………….. .. 1.450


GAS BLOCK DIMENSIONS

DISTANCE TO CENTER OF GAS HOLE FROM :
FR. OF GAS BLOCK / HOLE DIA. / R. OF GAS BLOCK



SAIGA .223……………… .990 …………………… .180 …………………………….. .418
SAIGA .308……………… 975 ……………………… .I80 ………………………….... .415
BULGARIAN 5.45 AK-74…………………………………………................................ .....
MAADI 7.62X39……………………………………………………....................... ................
HUNGARIAN SA2000M 7.62X39 ………….............................................. ........
HUNGARIAN AMD 65 ………………………………… .....133 .....................................
HUNGARIAN AMD 63………………………………… ......149………….............................
ROMANIAN G ……………………………………………..... 149………...............................
YUGOSLAVIAN AB2… .438 ………………….......149 ……….....................1.100
YUGOSLAVIAN VIRGIN KRINK………………………………................................. ........
YUGOSLAVIAN M72 RPK……………………………… ..122 ………...............................
RUSSIAN MILLED AK-47……………………………… .175………................................
ROB. ARMS VEPR 7.62X39………………………………………............................ ..........
POLISH U/F 7.62X39…………………………………....149 …………...........................
POLISH TANTAL 5.45X39………………………………………............................ .........
MAK 90 7.62X39 U/F…………………………………… 175………................................
MILLED TYPE 56 7.62X39…………………………….. 172……………………………………….....


BARREL DIA. @ HANDGUARD RETAINER

SAIGA .223……………………………………………………………… ………………………....... N/A
SAIGA .308………………………………………………………………………………………........ N/A
BULGARIAN 5.45 AK-74………………………………………………………………………..... .667
MAADI 7.62X39…………………………………………………………………………………..... .670
HUNGARIAN SA2000M 7.62X39………………………………………………………………... .668
HUNGARIAN AMD 65 …………………………………………………………………………...... .670
HUNGARIAN AMD 63…………………………………………………………………………...... .669
ROMANIAN G ……………………………………………………………………………………........ .668
YUGOSLAVIAN AB2…………………………………………………………………………....... .688
YUGOSLAVIAN VIRGIN KRINK……….......................................... .......... .689
YUGOSLAVIAN M72 RPK………………………………………………………………………..... .944
RUSSIAN MILLED AK-47………………………………………. ……………………………….... .686
ROB. ARMS VEPR 7.62.............................................. ....................... N/A
POLISH U/F 7.62X39........................................... ........................... .668
POLISH TANTAL 5.45X39…………………………………………………………………….... .657
MAK 90 7.62X39 U/F…………………………………………………………………………….... .688
MILLED TYPE 56 7.62X39…………………………………………………………………….... .688


BARREL DIA. @ FSB / OVERALL LENGTH OF FSB

SAIGA .223………………………… .... .594 ………………………………….................2.330
SAIGA .308…………………………. .....671 ………………………………………............1.625
BULGARIAN 5.45 AK-74………... .572 …………………………………………………… 1.300
MAADI 7.62X39…………………..... .572…………………………………………………….... .865
HUNGARIAN SA2000M 7.62X39 ….572……………………………………………………..... .850
HUNGARIAN AMD 65 …………….... .572…………………………………………………… .....850
HUNGARIAN AMD 63……………..... .572 ……………………………………………………. 1.050
ROMANIAN G ……………………....... .592 ……………………………….................... .865
YUGOSLAVIAN AB2…………… ......592 ……………………………………............. 1.235
YUGOSLAVIAN VIRGIN KRINK.......592 ………………………………....................1.665
YUGOSLAVIAN M72 RPK………… ... N/A……………………………………………........ 1.130
RUSSIAN MILLED AK-47………..... .591 ………………………………………………..... 1.170
ROB. ARMS VEPR 7.62X39………… N/A…………………………………………………… 1.050
POLISH U/F 7.62X39……………… .572……………………………………………………… .850
POLISH TANTAL 5.45X39……… .562…………………………………......................850
MAK 90 7.62X39 U/F……………... .592 …………………………........................1.165
MILLED TYPE 56 7.62X39………. .592…………………………….......................1.450


GAS TUBE LENGTH

SAIGA .223……………………………………………………………………………………… 6.970
SAIGA .308……………………………………………………………………………………….. 6.950
BULGARIAN 5.45 AK-74………………………………………………………………………. 6.970
MAADI 7.62X39………………………………………………………………………………… 6.970
HUNGARIAN SA2000M 7.62X39……………………………………………………………… 5.740
HUNGARIAN AMD 65 …………………………………………………………………………. 5.770
HUNGARIAN AMD 63…………………………………………………………………………... 6.940
ROMANIAN G …………………………………………………………………………………... 6.970
YUGOSLAVIAN AB2………………………………………………………………………….. 7.540
YUGOSLAVIAN VIRGIN KRINK……………………………………………………………... 6.060
YUGOSLAVIAN M72 RPK…………………………………………………………………….. 7.530
RUSSIAN MILLED AK-47……………………………………………………………………… 6.970
ROB. ARMS VEPR 7.62X39…………………………………………………………………….. 6.970
POLISH U/F 7.62X39…………………………………………………………………………... 6.970
POLISH TANTAL 5.45X39……………………………………………………………………. 6.980
MAK 90 7.62X39 U/F…………………………………………………………………………... 6.980
MILLED TYPE 56 7.62X39…………………………………………………………………….. 6.980





Might as well add these to it :

This is a list of reference dimensions of bolts and bolt carriers of the following AK rifles for those who are doing conversions or mods to their AK’s and want to know what will fit what.
All dimensions were taken by me off of bolts and carriers of my own personal guns or kits .
The following explains the terminology of the abbreviations in the tables.
Keep in mind these dimensions can vary a few thousandths either way due to tolerances from your parts.

(1) BF DIA. This is the diameter of the bolt face recess where the cartridge head sits when the bolt is in battery

(2) BS DIA. This is the diameter of the bolt stem (or shank if you like) that fits into the bolt carrier.

(3) BC TUN. DIA This is the diameter of the hole (or tunnel ) in the carrier that the bolt stem fits into.

(4) BC OAL This is the overall length of the bolt carrier and gas piston measured from the gas piston face to the rearmost tip of the bolt carrier

(5) GPL This is the length of the gas piston itself from the face of the piston to the front of the carrier where it seats against. (does not include the threaded part)

I thought it was strange that all the bolts are basically constructed the same (other than the bolt face dia. and bolt stem dia..) except the Saiga 308 which has had the stem turned to 2 diff. diameters approx. equal distances for the length of the stem.

Hope this helps those who are planning on doing these conversions or mods…………

Please bare in mind that these are reference only dimensions taken from my personal guns and kits. Your components will more than likely vary a few thousandths or more , but probly not enough to matter for most applications.
Happy swappin.........................

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Last edited by loner42; 09-18-2011 at 11:16 AM.
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Old 05-26-2008, 03:32 PM   #2
ronin
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Good info to have - thank you.
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Old 05-27-2008, 01:36 PM   #3
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thx. printed for my files. you probably already got this but it's pretty complete.
http://aa-ok.com/AK_Tech/aktechinfo.htm
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Old 05-27-2008, 04:18 PM   #4
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motorhead,
someone mentioned this site yesterday and i have'nt had a chance to check it out but just did. I remember seeing it a long time ago and forgot all about it. I have no idea what they measured with ( micrometer, calipers ) but i compared the dimensions that correlated with my dimensions and noticed that theirs were pretty consistently about .002-.003 bigger dia. than mine.

I kinda question the interference fits that they offered. A press fit of .001 is a very tight fit . They are quoting .003-.004 and .005-.006 press fits which i cannot even imagine any one pressing something that tight,especially since they are also crosspinned. If anyone wonders why their parts don't come right off in a press and gall really bad this would be a real good indicator.

Appreciate you sharing this info , some good stuff in there.
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Old 05-27-2008, 10:15 PM   #5
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Well, that info about the press fit dimensions really peaked my interest so i went out to the shop for some more measuring.All the dimensions on my list are actual barrel O.D. measurements. I did'nt check the I.D.'s of the mating parts, till just now. I checked 4 diff. barrels and components to see what the actual interference fit was . A Yugo AB2, Romy G, Saiga 308, and a Yugo Virgin Krink.

Checked barrel to trunnion, gas block and front sight fits. The heaviest press fit on all of them was .001 , some were .0005.
Kinda really makes me wonder who checked those dimensions on the aa-ok.com figures and what they used to check them with.

If you were to press a barrel into a trunnion, or gas block or FSB with a .005-.006 press fit you would NEVER get them off without ruining something .

My 02 centavos
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Old 05-28-2008, 11:09 AM   #6
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yeah, i noticed that too. .003-.004" is a really tight press fit. .001 you can usually hammer on.
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Old 05-28-2008, 11:16 AM   #7
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agreed with actual dimensions.all mine were between .001-.002.and also question who took the measurements.
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Old 05-30-2008, 12:13 AM   #8
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maybe an error in converting from metric.
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