AR receiver play
A while back I posted here asking about what to do about the play between the upper and lower on an AR varmit build. I followed the recommendation of getting a JP Enterprises tension pin. Installed it today (really simple) and am very satified. The rifle feels rock solid now. Lots of debate whether you should even worry about the play, but I feel much better about it now. I highly recommend this quick fix.
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I'm setting up an AR with a free-float varmit barrel. I noticed I have a slight amount of play between the lower and upper at the rear pin. Will this effect accuracy, and if so, what is the best way to fix it?
TIA!0 -
Most AR's have some play between the upper and lower. It will not effect accuracy as long as the barrel to upper fit is tight.
There is a little red rubber device called an "acuwedge" that you can get that goes in the rear part of the lower to tighten up the area by the rear pin.0 -
quote:Originally posted by Laredo Lefty
Most AR's have some play between the upper and lower. It will not effect accuracy as long as the barrel to upper fit is tight.
There is a little red rubber device called an "acuwedge" that you can get that goes in the rear part of the lower to tighten up the area by the rear pin.
+1 shoot 1st to see if any effect. Then acu-wedge it.0 -
quote: It will not effect accuracy as long as the barrel to upper fit is tight.
excuse me sir.., but the barrel to upper is screwed on and torqued, there is no reason for that barrel to be loose, if it is, he needs to find a person knowledgeable of an AR-15, (NOT all Gunsmiths are.., ya gotta ask'em)0 -
quote:Originally posted by USN_Airdale
quote: It will not effect accuracy as long as the barrel to upper fit is tight.
excuse me sir.., but the barrel to upper is screwed on and torqued, there is no reason for that barrel to be loose, if it is, he needs to find a person knowledgeable of an AR-15, (NOT all Gunsmiths are.., ya gotta ask'em)
Like I said, If the fit between the barrel and upper receiver becomes loose, it WILL effect accuracy. We all know they are screwed and torqued on, but that doesnt mean they cant come loose.0 -
LL is correct play will effect POI from shot to shot.. As others suggest an accuwede will help ALOT...So will a JP enterprises "Rear Tensioning Pen"
when the accuwedge and the JPE RTP are used in conjuntion there will be no play between upper and lower, even when useing a sling or bipod.[;)]0 -
quote:Originally posted by Farmer Brown
I'm setting up an AR with a free-float varmit barrel. I noticed I have a slight amount of play between the lower and upper at the rear pin. Will this effect accuracy, and if so, what is the best way to fix it?
TIA!
It will affect accuracy. Maybe not to the point you need to worry about it right now. I would get an accu-wedge for it as soon as you can. It'll only get worse if you leave it, let it ride around in the truck and it beats itself even looser.
How it affects accuracy is how you put your eye behind the sight or the scope. It's different every time when the butt stock isn't solidly in the same place. One time closed, next off to the left, open etc. Close that gap and close the groups. Besides, it's quieter when you put in an accu-wedge.0 -
"As long as the barrel to upper fit is 'correct', accuracy should not be a problem". I second that. Reason:
Loose fitting lower will not change the barrel to sight relationship. After all, you have to recover from recoil, and re-aquire a correct sight picture anyway...and you will be 'off target' as soon as you pull the trigger.
Ya hafta re-sight the gun prior to each shot! Best, Joe0 -
I've built a half dozen or so and been told it doesn't matter. I have no idea who's right and who's wrong but as a "sort of" older timer who shoots mostly bolt actions and single shots, any slop drives me up the wall. I always bed the upper to fit a particular lower to eliminate any movement, very easy to do. It does sometimes mean that particular upper will fit only that lower but I just prefer a rifle that feels like a unit as opposed to two halves held together with pins. I realize I may just be placating my prejudices though.
I'd be curious as to what the very serious competative AR shooters do - do they eliminate all movement between upper and receiver?0 -
Yes they do, They have a matching upper and lower mated to one another at extremely tight tollerances in the pens.. As in it takes a mallet to remove the rear pen.
If you ever look at a les baer match rifle, You will be vendicated of your seeming prejudice.
some of these rifles are designed to shoot the smallest groups possible at 1000 yards useing a tightly wound sling, they need every bit of riggidity that can be had.0 -
quote:Originally posted by quickmajik
Yes they do, They have a matching upper and lower mated to one another at extremely tight tollerances in the pens.. As in it takes a mallet to remove the rear pen.
If you ever look at a les baer match rifle, You will be vendicated of your seeming prejudice.
some of these rifles are designed to shoot the smallest groups possible at 1000 yards useing a tightly wound sling, they need every bit of riggidity that can be had.
why do you call them "pens"?0
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