First build help..matching upper & lower
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Old 07-05-2013, 10:40 PM   #1
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Default First build help..matching upper & lower

I'm building my first AR...first of all, thanks to EVERYONE for all their input.
My question is, is there anything I while consider or any minor tweaking I may need to do if I'm going with a lower and an upper from different manufacturers? It's a BCM upper and a spikes lower. They're both 5.56.
I didn't think I'd have to worry about it, but I read something in another thread about maybe running into minor tweaks I'd have to do?
An I mislead or what?
Thanks again..

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Old 07-05-2013, 10:52 PM   #2
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About the only thing that you should run into is a slight difference in color between the upper and lower, it might bug you at first, but you don't even care after a while

There may also be a slight bit of wobble between the upper and lower, which again isn't that big of a deal, you can remedy that with a $3 accu-wedge. Don't worry about it, it isn't complicated, I doubt you'll have any issues.

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Old 07-05-2013, 10:53 PM   #3
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You SHOULD be fine. These parts are made within a standard set of tolerances. But there is no way for us to know until you physically have the 2 pieces and put them together. Plus you have 2 very reputable brands going into it. That always helps

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Old 07-05-2013, 11:52 PM   #4
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I am about to order/buy my upper, and the thought crossed my mind too. I was considering buying another manufactures upper... Rock River is really slow right now, so many orders... I guess, I could get something else, and eventually match an upper later, and then user the one I order for another build... I like that...

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Old 07-06-2013, 12:03 AM   #5
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This was just covered in an active thread. One of the best ways to learn is to read the treasure trove of info in this forum.

http://www.firearmstalk.com/forums/f20/upper-93046/

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Old 07-08-2013, 10:51 PM   #6
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i ordered a del-ton lower and a PSA upper, i have an angle grinder, files, a dremel, sand paper, wire wheels, steel wool and a bench top grinder if i have any fitment issues LOL. i'm planning to duracoat them both so they match. i got an accu wedge just in case too

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