ouikikazz Posted February 7, 2017 Report Share Posted February 7, 2017 I've done some research over the last few days and all I'm doing is regretting buying my CMMG lower...but in any case I have it, it's the only brand my local rifle store sells and I live in the great state of NY so buying stuff is already a hassell. In any case I bought and built my CMMG lower about a year and a half ago with a CMMG LPK and Geisele SSA trigger and slapped on a Magpul stock and grip...all without a hitch and it wasn't until now that I'm looking to buy a complete upper just to finish my build and scratch the 308 itch that I'm reading more about possible incompatibility issues between uppers and lowers (should've done more research in the beginning). In any case I'm looking at an Aero Precision M5E1 20" complete upper and was wondering if I need to worry about it fitting or being that off that I can't even get it to work? Reason for choosing the upper is price is right (obviously) and they offer a 20" barrel and it's all complete and (so what I thought) headache free ready to pop on and be done. Question just lies if I will run into any problems with this choice upper or should I just settle and spend a bit more and get a CMMG complete MK3 upper with a shorter barrel? Quote Link to comment Share on other sites More sharing options...
shepp Posted February 8, 2017 Report Share Posted February 8, 2017 Welcome to the forum feel free to tell us about yourself in the intro section. its always recommended for best fitment with the large frame AR's to match manufactures for best fitment due to no milspec Quote Link to comment Share on other sites More sharing options...
BIGBREW Posted February 8, 2017 Report Share Posted February 8, 2017 Welcome to Dictator Cuomo's poop hole! Quote Link to comment Share on other sites More sharing options...
AnOldBiker Posted February 8, 2017 Report Share Posted February 8, 2017 Welcome to the forum Quote Link to comment Share on other sites More sharing options...
survivalshop Posted February 9, 2017 Report Share Posted February 9, 2017 (edited) I had a very early CMMG Lower up until late last year , I had a Billet SI Defense Gen. II Upper on it & it worked fine with any Metal Mag I used in it , just did not work reliably with the first Gen. of Magpul LR Pmags > I tried just about everything to get it to work with those Mags. , but gave up on them & just used Metal Mags , then Magpul Came out with the Gen 3 LR PMags & they worked fine in it . Not sure how the CMMG & Aero will play together , only way to know is to mate them & go from there . The Rifle liked Lancer L7's from the get go . Edited February 9, 2017 by survivalshop Quote Link to comment Share on other sites More sharing options...
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