AR Upper/Lower Receiver play.

I never had the honor or privilege to serve in the Armed Forces of the United States, but my first AR was a Colt car 16, before they were ever putting forward assist on any of them.. it was really sweet although all my buddies made fun of my Mattel gun. Next was a Bushmaster carbine, from back when they were made in Maine, also a sweet AR. Back then never paid attention to play between receivers and been told numerous times by numerous real experts it does not affect accuracy, although it's still really bugs me. Now with two LMT AR-15, one LMT AR-10 with good snug non
rattling fit between the upper and lower, it has become the first quality I look for in an AR. I just got a CMMG 458 Socom that shoots 300 grain like a laser beam at 50 yards, but that damn tiniest little rattle from a little bit of play. Accu wedge and the O-ring thing are both bad because they force the receivers apart. JP takedown tension pin is no longer available anywhere I can find, but you can find lots of zip ties almost anywhere. I cinched one down from the rear slot on Picatinny angled slightly forward to rear of trigger guard. Then another under the front pivot pin up to the appropriate slot on the Picatinny. No more rattles. Me big happy camper cost $0.25.

Do not grab your duct tape just because you can't find those last two zip ties you thought you had. The duct tape will make a sticky mess out of your rifle. This advice pertains to NASCAR fans and other Goobers

ontarget said:

In Marine boot camp my platoon was issued brand new unfired M16A2 service rifles. It was a long time ago but I do remember they were less than a tight fit. All of my current ARs have a tiny bit of slop. It has never bothered me.
For all of you AR haters out there tell me another rifle you can crank down with a zip tie to keep it in service? LOL. Legos rock!
Great idea Stormie. You should patent that accessory.

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Thank you. I opted not to use the stainless steel zip ties as it would eventually eat into the aluminum receivers it only gets it the teeniest bit snugger than the plastic ones. Plus the plastic ones are easy to cut if you need to open your receivers and easy to replace I keep a couple stored up in my grip handle.

Also it is best to use two shorter zip-ties hook together rather than one long one. And this way you can pull the both sides down together simultaneously. A single long tie has a constricting effect and can torque the upper in relation to the lower one way or the other.

Beretta Professor I guess you missed the part where I said it shoots 300 grain pills like a laser beam. Do you have a458 Socom that is built on a AR-10 receiver and Bolt? Milspec allows up to .012" play.

berettaprofessor said:

Darn it Stormie, now you've got me thinking about a 458 Socom, even though I've got few reasons to want to bust through a cement wall. I imagine it has a bit of a kick????.....

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The recoil was nowhere near as bad as I expected. It is about the same as a 308 out of my M1A. It is nowhere near as bad or sharp and painful as my Garand in 30 ought 6. To my knowledge CMMG is the only one making a 458 with an AR-10 bolt everybody else is using a milled out AR-15 Bolt. I think this is the primary reason that the recoil on mine is not as bad as reported by most who have AR-15 bolts.

imashooter said:

Someone else does that. I'm thinking the Saint. Anyhow, though it "tightens", doesn't it also increase the gap between the receivers, at least partially (the rear)? That would send me into orbit.

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Zip ties are the way to go effective and cheap and easily replaceable

Physiomesh, negative I have two zip ties squeezing upper and lower together they don't interfere with anything nose goes against everything and make it Rock Solid.