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Thread: HK416 buffer weights?

  1. #21
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    Quote Originally Posted by AF2 View Post
    Stock MR556/416 10.3. I noticed the brass ejection towards 2/3 o'clock suppressed, 4/5 unsupressed.
    Just received my 10.4 back from nitriding. Same results with HK buffer spring / H2 combo / SDN-6 / M193. Will try H3 and report results.

    welded 14.5 gas block + H3 +stock buffer + SDN6 + M193 ran like a top supp and unsupp
    Last edited by griff400; 05-27-2019 at 04:29 AM.

  2. #22
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    My son just came back for leave and his MR556 Upper had came back from Marvin Pitts of Nefarious Arms where it was chopped to 10.4, re-profiled, nitrided and a Surefire Warcomp added. Well unfortunately test firings of 24 rounds didn’t go well. The bolt carrier is short cycling. It extracts the round @ about 3 o’clock, but doesn’t go back far enough to pick up the next round in the magazine, or lock back on an empty magazine. I came home and compared it to my 10.5 inch M-16 and found that the MR 556 buffer weighs 5.1 ounces compared to my H2 buffer that weighed 4.6 ounces. The HKMR556 buffer spring was approximately a quarter inch shorter in length then my M-16 buffer spring. However the HK MR 556 Spring feels stiffer. I don’t feel that the ammunition is the issue. We were using federal 62 grain green tips. I have a hard time believing that it would be a gas port issue as everything I have read shows that the MR 556 rifle‘s are supposed to be over gassed... any ideas? The rifle was brand new before sending it off ...
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  3. #23
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    Use a M4 carbine spring for an immediate fix.

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  5. #24
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    Thanks for the reply. Is the MR556 spring heavier? It does feel a bit stiffer despite being slightly shorter.

    Quote Originally Posted by tlrgsxr View Post
    Use a M4 carbine spring for an immediate fix.

  6. #25
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    Yes, it is, for “reliability”, read round stripping power when dirty.

  7. #26
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    ^^^^copy

  8. #27
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    Well, did some testing. W/ a Larue aka springco red carbine buffer spring, still a no go w/ standard buffer, H2 buffer and HK 5.1 ounce buffer, extraction at 3 o’clocK. With an LMT mil-spec buffer spring Hk buffer and h2 buffer, the gun cycles fine and extracted at 4 o’cloc As it should, BUT, it won’t lock back on an empty magazine....LMT mil-spec spring and standard buffer, it cycles, extracts 4 o’clock and locks on empty magazines... I’m saying Marvin should have opened the gas port.... seems under gassed at 10.4

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