Ok, I realize that this might fall into the category of a short stroke, but would like to run this by you folks.
I attended a two day carbine class in Sacramento this past weekend and brought out the following upper setup:
* LMT 16" M4-type upper with ~1k through the tube prior to class.
* Denny's super-duty AR15 BCG with ~400 through prior to class.
* BCM Gunfighter Mod4 CH
* Troy rear BUIS
* DD Omega 7.0
* Aimpoint T1 + LaRue LT660 tall mount
The lower is a Bushmaster with a Magpul BAD and LMT SOPMOD kit with H-buffer.
Ammunition run throughout the course:
* 565 rounds of XM193 boxed
* 160 rounds of PRVI M193
Magazines run were all USGI with Magpul followers and Ranger Plates.
Day1 was a flawless day and all rounds down range were with XM193. However, Day2 proved to be slightly different due to five occassions that had the same symptoms.
- Action would cycle
- Action would sort of lock to the rear on near empy magazines (7-8 rounds) but was not hung up by the bolt catch/release.
The bcg would just seem to "hang up" nearly to the end of it's travel but just a bit shy of full rearward movement to allow a new round to be stripped. The PRVI was mixed in with the XM193 on Day2 as there were partially loaded mags leftover from Day1 that were filled the night before.
Unfortunately, during the heat of the drills, I was unable to mark all the magazines used during the five malfunctions except for two of them. One of them looked great whereas the other one had a slightly bent feed lip on the right side. As a side note, I did realize that the malfs seemed to occur when an odd round was ejected and an even was about to the stripped.
Upon cleaning and inspection of the rifle, the BCG looks to be in great shape. The bolt seems a bit loose in the bcg, but does not fall out or extend when tipped upside down.
So, ammo or mag related?


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