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Posted: 8/28/2004 5:33:29 AM EDT
Just built a couple of RRA lowers. Tried several non-RRA uppers and all will require some fitting.

Do new RRA uppers fit new RRA lowers without fitting? I'd rather not modify a bunch of uppers that fit perfectly on my other lowers just to fit these new RRA's. Might just get a couple of dedicated uppers for the RRA's and was wondering if RRA lowers fit RRA uppers without fitting.
Link Posted: 8/28/2004 11:45:32 AM EDT
They'll be probably a bit snug, but opening and closing a few times should make them nice and easy, with no loosness.
Link Posted: 8/28/2004 12:29:59 PM EDT
They will break in after a few hundred rounds.
Link Posted: 8/28/2004 2:57:22 PM EDT
RRA lowers are very tight even with RRA uppers. I had to use a mallet to make my last RRA M4gery go together. It loosened up after soaking a while in CLP and shooting.
Link Posted: 8/28/2004 3:04:32 PM EDT
Ditto on the mallet. I had to use a block of wood and a hammer to get them together and apart. Its also a pain to get them apart, to the point where I'm considering some dremel action. It was tight with two different RRA uppers and a Colt upper.

Hopefully a couple hundred rounds will loosen her up.
Link Posted: 8/28/2004 3:21:54 PM EDT

Hopefully a couple hundred rounds will loosen her up.

Must be a tough one...Usually a couple rounds get her loosened up....

MT (mind in the gutter)
Link Posted: 8/28/2004 3:35:31 PM EDT
Link Posted: 8/28/2004 3:41:32 PM EDT

Originally Posted By TREETOP:
The RRA lowers that I've owned haven't been relieved in the back for the upper's rear lug. Hard to explain without a picture, but the radius wasn't opened up at the very back to allow the lug to drop in and out freely.

It only requires a small amount of filing/shaping on the very rear sides of the upper's lug, but I don't think that should have to happen- I think RRA should open the cavity a little instead.

Yup, that's exactly what I've experienced. Kinda disappointed. How do they fit their uppers on their factory guns?
Link Posted: 8/28/2004 4:14:13 PM EDT

Originally Posted By TREETOP:
I think RRA should open the cavity a little instead.

My feelings exactly. Filing new parts to make them fit is unacceptable in my book. I'm also not convinced that the tight fit does anything for you or your accuracy. IMHO/YMMV
Link Posted: 8/28/2004 4:40:59 PM EDT
Thanks for the info. I went ahead and shaped the rear lug on one upper (CMT) mainly to see how much it would take. As mentioned above, it didn't take much but I wasn't too happy about the whole idea. These were my first two RRA lowers and probably my last.hinking.gif Got a bunch of Ameetec's on the way
Link Posted: 8/28/2004 5:18:54 PM EDT
Agreed...no need to fight with the damn things .
Link Posted: 8/28/2004 8:08:27 PM EDT
I've only built one RRA rifle. Used a RRA upper and lower, and didnt have any trouble at all getting the two together. There is no play in them, but I certainly didn't have to force them or use a mallet!

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