AR Sponsor
Posted: 5/28/2009 6:31:03 PM EDT
| What do you consider acceptable upper to lower reciever gap? After a 5 month back order, I just recieved a flat top upper and misc. parts. This upper from Del Ton, mates to my Armalite lower, with acceptable tightness. But the gap between the two looks huge, with light visible between. My four other builds run .002 to .005, this one runs .008. I know that eight thousanths is not really a big number, but it looks huge compared to the other rifles. Should I just get over it ( too anal ) or can I do something about it? |
|
I wouldn't even worry about it. You could end up replacing it and getting one with even more play. I'm the same way, I like having the tight fit, but it doesn't affect performance, so no worries. You will get mixed reviews on the Accuwedge, but they seem to work. There was also another member that took a small o-ring and placed it on the upper receiver around the base where the holes line up with the lower.
Joseph |
|
NO gap is acceptable...
If you have more than one lower receiver – try switching them around until you get the best possible fits between all your guns. I built on two STAG lowers and am pleased with the quality. That said, I had one that seemed too loose and another that was so tight I could not get an upper to fit. I switched them around and got one that fits dead-nut perfect (with absolute zero play) with my LaRue 18-inch SPR-style upper. My Noveske N4 light then had barely imperceptible play, so I got some of those red-urethane “accu-wedges” and trimmed one of them down until I could just barely get the upper closed. Perfect fit resulted. Now that both of my rifles are 100% tight, I need to use a piece of Delrin rod as a “punch” to knock out the pins or push really hard with a bullet tip. This seems right to me – but I will tell you that I’m damn sure no kind of “AR expert” and have only had my AR’s for 8-months or so. I’m no stranger to shooting or gunsmithing with nearly 30 years experience – but I only feel that it fair for me to mention my extremely limited experience with AR-15 rifles. I know that WAY more people know WAY more than me about these guns, so take from my suggestions what seems to fit, and consider everything else other offer too. Good luck, and God-speed. |
|
Gaps are no problem. The same goes for "rattle" between the upper and lower.
Function and accuracy are not effected in any way. The little red wedgie thingy works as advertised. When installed correctly it can't get loose and float around in the lower as it is trapped beneath and behind the rear lug of the upper receiver in the same fashion as a RDIAS. A dab of adhesive would only be a back up to ensure it stays in place when the upper is separated from the lower. That said, those that dislike them do so strongly. One of our forum members has had good luck filling the upper/lower gap with J-B weld. It gave his upper and lower a perfect bedded match. You can search the threads. |
AR Sponsor