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Posted: 11/23/2006 4:00:48 PM EDT
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I went to the range yesterday with my new 10.5" LMT upper on a CMMG pistol lower. CMT 16 BCG & VLTOR buffer tube (no stock/pistol friendly) with a carbine spring and H2 buffer. 60 grn Federal ammo. eta: KX3 muzzle break. Began experiencing short stroking. One shot w/good extraction and no new round loaded.  New CMT carrier and key appeared fine. Bolt and rings looked fine. Well lubed w/CLP. Tested upper on another pistol lower with a Colt buffer tube (no stock/pistol friendly) & spring and the upper ran fine.  Began suspecting the H2 buffer and buffer spring since the VLTOR tube is atleast an inch+ (??) shorter than the standard Colt tube. I rightly/wrongly?? suspected there was too much buffer spring tension with the shorter VLTOR tube and decided to start cutting the spring down. After 3 successive cuts amounting to about an 1 to 1 1/2 inch reduction in the buffer spring I kept getting better results. Finally I replaced the H2 buffer with an H buffer and it seemed to run flawlessly. 600+ rounds all total, about 300 rounds post corrective measures. Is this an acceptable long-term fix? Is there a better way? Am I missing something here? Any helpful thoughts or suggestions are appreciated.  ThanksSnakeEyes |
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If the standard carbine buffers work with the rifle, the cavity depth of the short receiver extension is the same as a rifle unit. The H buffer would be used if over function was at hand, and I would have swapped it first before doing anything with the spring. Granted that you now have the pistol running with the clipped spring, keep a close eye on the pistol as it breaks-in/parts mate, and if you find that the pistol starts to have excess recoil, then the clipped spring will need to be replaced with a stock unit. |
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