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Posted: 11/23/2009 12:39:14 PM EDT
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I heard this colorful expression for a real bad jam on the Ar15 after helping a guy with a brand new M&P - the fired case had gotten stuck over the bolt carrier - I was able to extract it by tearing the case apart with long needle nose pliers (almost like forcepts) through the ejection port . I kind of rolled the case up like a sardine can until I had clearance to extract the base of the cartridge.
Well, last weekend at a 3 gun match it happend to me - my new Rock River M4(kinda) with intermediate gas system had the FUBAR jam - I was DNF for that stage and most folks had never seen a jam like that - shooting my reloads from a Magpul 30 rd mag - I have no idea what happened, but there it was. Found the same long needle nose pliers in the tool kit and 15 minutes of frustration later I got the case out and the gun apart. Cleaned it up and shot the next stage with no issues at all. Who else has had this and does anyone know why it happens and by any chance is there a better way to fix it than the dang pliers? I do not always have this tool kit with me. Thanks. 
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Might want to go with a stronger extractor spring (colt M-4 black insert) to confirm that the spent case is not dropped before the end of stroke, and even confirming that the ejector is not binding up in the bolt face as well, hence not correctly ejecting the spent case at the end of rearward stroke stall.
Both of these will leave a spent case in the action (not ejected out the port correctly), and when the bolt drives back forward, it can create just such a jam. |
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I've had it happen before. You can lock the bolt back by either the charging handle or using your finger through the ejection port and pushing the BCG back. If you use the charging handle, the handle will obviously not retract all the way, but the BCG should move all the way back. Then just reach up and wiggle it out.
Not really sure what causes it. I've had it happen once with Wolf ammo (among thousands of rounds). |
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