BCM upper update.
Okay, finished my first M4 build (w/BCM upper) several weeks ago, and have put several hundred rounds through it.
BCM 16" middy
LMT semi auto BCG
LaRue 9" tactical guards
Stag Lower
Standard buffer in collapsible stock (I do have H Buffer but haven't tried it yet)
LPK (sorry can't remember brand, but not DPMS)
-all components mil-spec
Primary intended uses: Defensive, and range fun
Using FMJ 52 grain ammo (Winchester, and Lake ammo), i haven't had a single misfire or malfunction so far. No conditioning was done for "burning" in the barrel, nor has the bore been cleaned (beyond the initial cleaning after assembling). All parts lubed with Slip 2000 EWL, and using Magpul 30 round mags.
During assembly the only catches involved the roll pins for the bolt release and the trigger guard; ended up crumpling both of them. Purchased some Colt replacement pins and they went in without a hitch. Dissassembled and thoroughly cleaned it, looking for wear marks on charging handle, BCG, guide rails inside the upper, and hammer. Wear marks were starting to show, but they were nice and evenly distributed along surfaces, compared to seeing only a few wear marks at irregular points. Out of the case with no sight-in (MI BUIS), my daughter was able to hit ram siloutte at 200 yards 6 out of 10; better then my son was able to, which she still reminds him of.
Comparisons:
Qualified with department S&W M4's
Colt M16's
DPMS AR-15 (friend's unit)
Conclusion:
All the firearms mentioned worked as required, though i have had magazine hangups on the S&W which may have been due to damaged magazines. For me, the accuracy of my build is noticeably better then the S&W, and the DPMS, but at the same time my M4 fits me better with a better balance.
If i were to build another M4/AR15 I would have to go with the BCM upper again; it's been too good to me. The only alternative i would consider at this time would be a Noveske Barrel, but you still won't get the attention to detail that BCM gives their upper packages, unless maybe Grant puts something together (he did tempt me with a Noveske 16" with low profile gasblock).
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