Bipod

[Andy]

Hi. I have Norinco 56S rifle and I want to mount bipod under it. Where should I mount it? My friend have Versa-Pod bipod and the adapter should have mount to the barrel. We thaugt that it is not wise and he mounted it to part where the gas tube meets the barrel. Is this a good way? Or is it able/wise to mount it to front stock?

(Sorry my bad english. It's not my home language and I haven't got a dictionary.)

[Packrat]

Best place to mount it would be at the front of the receiver. If mounted behind the front sight, the rifle will shoot way high. The barrel vibrates when the round is fired, and it whips down, thrusting the barrel up away from the ground, or or whips up, throwing the barrel high.

If you could find the node--where the barrel doesn't vibrate--that would be the ideal place, but it's probably under the forearm. (This may be difficult to understand. Get your highschool Physics book and read up on vibration. It'll have the same concepts, but in your language. Technical terms are tough to translate.)

[Andy]

Well. I understand quite well about physics terms because I study it in university and our all books are in english. But I have thaught that the longest resonance wavelength is twice as long as barrel so that nodes are in the ends of barrel. And of course there must be many subfrequencies. I have never heard that it would be able to mount something in the node of waves so that it doesn't make accuracy worse. Especially because not only vibrations effects but also tensions that bipod makes in barrel.

[Andy]

I bought Dektyarev light machine guns bipod. Only easy way to mount it is to gnaw the front stock so that bipods own mounting system reacehs ovet the stock. Do you think that it will harm accuracy, because the front stock presses barrel?

[16r40]

"Do you think that it will harm accuracy, because the front stock presses barrel?"

we're talking AK here.....accuracy for that is being able to hit anywhere on a man size target at 100 meters.

[Andy]

The bipod is for hitting plate at 150 meters. Accuracy of my gun is about 3-4MOA. Enough for this and bipod should do it easyer. I have Lahti-Saloranta LMG:s barrel in my gun, not Norincos .310-.315 barrel.

But it is possible to destroy AK:s accuracy so that it is 10MOA and this is not enough for my needs.

[Packrat]

The frequency does not depend on the length of the barrel; it depends on the load, weight of barrel, pressure of the stock, etc.; even a change of bullet weight will change the frequency. One way of finding a node used by old gunsmiths was to hang the rifle by the barrel from a door frame or some other support and hit it with a piece of wood to make it ring; the point where it doesn't ring is a node, and the point at which the stock is bedded for maximum effect. You could mount the bipod there and get the minimum effect