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By your writings (with alternate/fall-back Bushmaster spares) this is a duty or agency-owned weapon?I have had several brass cases fail to extract and end up stuck in the chamber of my rifle during the past couple trips to the range. The rifle is a basic stock Colt M16 Commando. Total round count for the rifle is around 9-10 thousand. Rifle is always fired wet using Slip 2000 ewl. This only happens on full auto firing when the rifle is hot, and only with Winchester 55 grain FMJ 5.56 white box.
With stoppages starting under known conditions (full auto and hot) I'd have the Commando re-barreled -- you already know the barrel life, and you're starting to apply band-aids without knowing the source or proximate cause of the stoppages. You could stop shooting full auto until the rifle gets hot (humor me -- why are you doing this? Do you have a mission or job requirement to shoot full auto until the gun is hot enough to abuse the barrel in the first place?).
Everything on the Commando is going to be more problematic than the 6920 with a 14.5 or 16-inch barrel -- you are shooting a weapon with a narrower performance band due to the short barrel and dwell time.
"Not every thing on Earth requires an aftermarket upgrade." demigod/markm
If it only happens in F/A, would it make sense to swap uppers with the 6920? You could try different combinations of uppers & BCGs to see if you can narrow down the culprit between barrel issues (chamber and/or gas port erosion), extractor, ammo, etc. You could also try swapping the buffer springs as that would be easy enough to try to rule out.
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Last edited by Ryno12; 05-23-13 at 12:42.
Probably 9 times out of 10 given the same facts and circumstances, this would be a true statement, unfortunately this is not one of those times. This weapon is used on a regular basis for entries, vehicle assaults, buy/busts, and other operations that we will not discuss here. Maybe my sub-par cell phone pics left out some receiver wear, but it's actually not bad given the round count. When I say "regular basis", I mean sometimes every day, sometimes several days in a row, but I definitely don't mean I use it every single day.
This weapon has also been fired mostly semi-auto with .223 practice ammo. Over the past few years, it's been mostly Hornady steel cased. If fired F/A, it's controlled 2-3 round bursts.
When I think of "range blaster", I picture a guy going with his buddies on Saturday morning spraying F/A to look cool and show off. This is not the case. None of my friends go to the range with me. Most of my time on the range is spent in the late evenings or very early morning hours when nobody but a co-worker or two is around.
Thank you for the input and I will keep you posted of the progress if you like.
There was a recall on some bad lots of Winchester ammo check your lot numbers on this as well
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