
Originally Posted by
Robb Jensen
Yes:
HK...cracked upper receivers when shot hard suppressed. Firing pin safety failures. Broken bolts.
POF...highly worn receiver extensions which caused erratic bolt velocity which was causing failure to eject, failure to feed etc whenever the bolt carrier would get caught in the trough cause by carrier tilt. Cracked bolt, cracked log at top of bolt. Large amount of finish wear/gouging caused by front-top of bolt carrier dragging along the receiver bore as the carrier tilt. A temp fix is a new receiver extension and new upper receiver (two things that don't really wear out in DI guns by the way). One particular POF I've seen will not run on this one particular AR lower but on that same AR lower all DI uppers (7 different ones) worked just fine. Corrosive pitting of the gas piston and op rod. Broken bolt lug which got between the carrier and upper receiver and ruined the upper receiver which required a new receiver and new bolt.
early ARES....bent op rod in less than 600 rounds on full auto on a 11.5" upper, due to spigot coming lose after the gas tube roll pin 'exited stage left'.
LWRC...I've thus far fixed 4 lose barrel nuts, replaced heavy worn receiver extensions with this wear causing unusual stoppages (fixed with a new extension and anti-tilt buffer). Early ones had carrier keys coming lose before they key was integral to the carrier. On two early one I replaced two broken bolts (before Matech).
PWS...lose gas block (2nd gen after moving away from a pinned gas block to a set screw gas block). Newer pinned Diablo style is much better. 1st gen I had the piston (which is attached to the carrier) came lose but I caught it before it caused stoppages.
LMT...highly worn receiver extensions from carrier tilt causing unusual stoppages fixed with a new receiver extension and anti-tilt buffer. Lose barrels if not checked regularly.
So to summarize what I've said in the past, If Eugene Stoner wanted the AR to be a 'gas piston' design he would have made it that way from the get go. Trying to make the AR15 platform a piston gun is like Chevrolet back in the day trying to make a good diesel engine out of the small block 350 (5.7L) engines ...it didn't turn out to well.
+1 on the junky chevy diesels.Oh and trying to make the AR platform something it was never meant to be. People will never stop trying though.
Whoever said the pen is mightier then the sword
obviously never encountered automatic weapons.-MacArthur
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