Home Forums Hunting & Shooting AR and Tactical Rifles Wiggle.

Probably a stupid question but I'm an AR idiot, so be gentle.

Is a little wiggle between the upper and lower normal?

How does it affect accuracy?

Thanks.

Doesn't affect accuracy. If it bothers you get an accu-wedge for about $2, no more wiggle.

Thanks.

People think the wobble is up/down, but it's usually more side to side, caused by the hinge pin / hole fit.

.38 solution. Go to hardware store, buy a delrin/plastic shim washer, close to .25" inside diameter as you can get, hopefully less than 1/2" OD, so as not to stick out.

Enlarge hole to .25" if necessary.

Separate the upper from lower.

Tricky part (to describe, at least):

Holding rifle sights up,

Slide washer vertically between *front* (barrel end) "lower" hinge frame and upper, on bolt release side pin and insert upper into lower, as if you were reassembling, should be a tight fit now.

Push pin through lower, as usual, shut the upper, should eliminate wobble.

A foam earplug will do the same thing if you're a cheap bazzdard.

The actual answer is it does affect accuracy.

But its so minute in my testing it won't matter to almost anyone..

In 300 yard testing, 10 shot groups, I shot a lot of groups with the loose upper/lower. Then I bedded the 2 together, with steel bed, and got it tight.

Two things showed.

10 shot groups became more round and consistently shaped.

10 shot groups shrank in size appx 1/10 of an inch.

Made me feel better with a tighter gun.

Seemed like I shot a hair better.

But for the most part I don't think it really matters at all.

I've put accu-wedges in a couple that were rattle traps and they tightened up like you'd expect, but it was a bear getting the rear pin in when cleaning. Press like hell and needed a 3rd hand to shove the pin.

I agree with the rest of the post too, but I honestly think anything that gives a guy more confidence is important and worth doing!

Thanks all.

I've never seen tightening the upper to lower fit to make a hill of beans over 12 or so AR15's and 5 AR10's.

One of the things i like about a lot of the billet lowers outside of oure cosmetics is that many of them have a nylon tipped screw under the grip to tighten them.

Sand or shave off the bottom of the wedge a bit till its just snug.