This is topic AR bipod question in forum Firearms forum at The New Huntmastersbbs!.
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Posted by Cdog911 (Member # 7) on January 15, 2011, 05:52 PM:
Since this is THE board for posting all inquiries related to AR rifles, and since everyone here will be spinning and spitting at the prospect of using EBR's on coyoteeees, I have a question. I saw a bipod for AR rifles that clamps directly to the barrel rather than attaching via a rail. With the pod folded up, I wouldn't see it messing with the harmonics of the barrel and altering your zero, but with the gun on solid ground, on the pod - clamped to the barrel - wouldn't that totally trash your POI from POA? Just curious...
Your thoughts?
Posted by TA17Rem (Member # 794) on January 15, 2011, 07:06 PM:
Almost anytime you attach something to a barrel you will have to site it back in and same if you remove it...
AR's have a gas block attached to the barrel and dose'nt seem to bother accuracy, and same can be said for screw on muzzle brakes or suppressures.....
Posted by TOM64 (Member # 561) on January 15, 2011, 07:18 PM:
Yes the el cheapo GI bipod would destroy accuracy. I guess it's for the spray and pray boys that can't hold their guns up long enough for a mag dump.
Posted by Q-Wagoner (Member # 33) on January 19, 2011, 03:06 PM:
I personaly would never clamp any bipod to a barrel. It will will make the point of impact unpredictable. Other than the overall quallity of the barrel, consistant/repeatable barrel harmonics will play criticle role in a rifles accurcy. Top barrel makers go to great lengths to stress relieve ther barrels. A stress free barrel will will be more predictable than a stressed barrel. Anything that interrupts the harmonics of the barrel will affect your point of aim. At close range it wouldn't be that big of a deal but would be evident at longer ranges.
Good hunting.
Q,
Posted by Leonard (Member # 2) on January 19, 2011, 03:15 PM:
That's a good point, Quentin. I guess? Personally, I would never think of attaching a bipod to a barrel, harmonics being what they are, nor would I do any shooting with the barrel rested on anything, for the same reason. Maybe, with machineguns, it don't matter much?
Good hunting. LB
edit: and yes, Lance. This is AR CENTRAL. Headquarters for all machinegun questions.
PS what does EBR mean?
[ January 19, 2011, 03:18 PM: Message edited by: Leonard ]
Posted by Q-Wagoner (Member # 33) on January 19, 2011, 03:47 PM:
I am accuracy minded and there is no doubt that I demand more from my coyote rifles than what is really needed. It is no coincidence that competitive rifle shooters like there barrels fat and free floated. The further you get away from that standered the more dificult it will be to achieve a high level of accuracy.
Good hunting.
Q,
Posted by Paul Melching (Member # 885) on January 19, 2011, 05:14 PM:
EBR= EVIL BLACK RIFLE
Posted by Cdog911 (Member # 7) on January 19, 2011, 05:45 PM:
Sage advice, thus the question. Local gun plumber told me that you can have anything you want attached to the barrel and it will not affect accuracy, as long as that anything is attached to the barrel and touches nothing else, like the ground. Perfect example is the scope mount on those little Handi-Rifles. Damned straight shooters, even with the optics mounted on there.
Posted by Leonard (Member # 2) on January 19, 2011, 06:09 PM:
Maybe not?
Posted by TA17Rem (Member # 794) on January 19, 2011, 06:26 PM:
You can put most anything on a barrel from muzzle brakes, silencers, suppressures, forearm of a single shot rifle,tape and so on. Yes it will change the harmonics and thats why you have to site it in each time you make changes to the barrel. The shorter the barrel the less its affected.. Look at the Browning Boss system for example, its basicly just a weight on the end of the barrel moved back and fourth to balance out the harmonics for a certain load...
If you do some searching you will find that some of the bench rest shooters use a device called a tuner, it looks like a suppressure but is actually a boss system.. My gunsmith uses one on his comp. rifle and has won matches with it..
Posted by Leonard (Member # 2) on January 19, 2011, 06:45 PM:
If you screw a suppressor or a muzzle brake on a barrel, expect a change in point of impact and possibly, accuracy as well. There is no doubt in my mind that a scope mounted on the barrel is detrimental to accuracy. Just cutting an inch or two off the length can change all those harmonics, sometimes it's no big deal, but when measured in thousandths, it CAN make a difference. A bug landing on the muzzle of a long barrel can cause a deflection. Well, I can't prove that, but like was once said: Give me a long enough lever, and I can move the world. Who said that, I can't remember, other than he was Greek, (I think?) but in theory, he's right.
Good hunting. LB
Posted by TOM64 (Member # 561) on January 19, 2011, 06:54 PM:
Well, yes a suppressor can change bullet impact as well as changing flash hiders. Some flash suppressors can help accuracy even.
But for the el-cheapo bi-pod Lance is talking about, it was designed for a gun that with it's ball ammo was required to shoot at least 4MOA groups and they called it good.
Adding something to the barrel won't make much difference as long as it does not induce stress to the barrel. Over tighten an A2 flash hider and watch the groups open up.
Tim, I was sure you'd have one of them accuracy enhancing donut thingies on your barrels...
Posted by TA17Rem (Member # 794) on January 19, 2011, 07:09 PM:
quote:
Tim, I was sure you'd have one of them accuracy enhancing donut thingies on your barrels...
LOL Tom.. Nope.. Plenty happy with 1/4"- 1/2" groups.. ![[Big Grin]](biggrin.gif)
Posted by TOM64 (Member # 561) on January 19, 2011, 07:19 PM:
There's always room for improvement....
Posted by Kokopelli (Member # 633) on January 19, 2011, 07:26 PM:
El Bee;
That was Archimedes that said the lever / fulcrum quote.
Posted by Q-Wagoner (Member # 33) on January 19, 2011, 07:26 PM:
Yes and no. Every thing added or taken off the barrel will affect your point of impact. Bipods will not be a solid attachment like a muzzle break, tuner or metallic sights thuss accurcy will be less predictable. In mho, if your tube has a sling swivle get a set of Harris S-series bipods and be done with it.
Good hunting.
Q,
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