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View Full Version : M4 buffer Spring T&E



JGifford
30 June 2016, 20:13
The rifle is a DDM4 with an Azimuth BCG, JP gas-ring (1 piece), and carbine RE. The gas-port was pin gauged at between 0.0735" and 0.0745". There is roughly 5,000 rounds on this rifle, with about half of it on the Azimuth BCG. A Colt mil-spec ejector spring was used, and a SAW/Ken Elmore "Green" extractor spring with black mil-spec buffer and no O-ring was used. The suppressor depicted is a Surefire 556-212. Ammunition used was .223 Bronze 55gr for unsuppressed videos, and PMC XTAC M193 55gr 5.56 for suppressed videos. The same H2 buffer was used for all videos, with the exception of the Geissele Super 42 videos, which used the included Geissele buffer, re-configured by me, to H2 weight, with the spare weight Geissele offers for it.

https://www.youtube.com/watch?v=utg9gPFrHOE
https://www.youtube.com/watch?v=Lk6KshcVD4Q
Tubb 17-7 Flatwire Spring

https://www.youtube.com/watch?v=5mbgrK9VUQc
https://www.youtube.com/watch?v=IOddT0Ak6UA
Sprinco "Blue" spring

https://www.youtube.com/watch?v=pQIs-qcwpKs
https://www.youtube.com/watch?v=9dpNir_G_fQ
Geissele Super 42

https://www.youtube.com/watch?v=KwssoYuN40M
https://www.youtube.com/watch?v=EDd9I-bmTSM
JP Polished/Tuned

https://www.youtube.com/watch?v=dhblpS5s0sc
https://www.youtube.com/watch?v=HBsgG9-AKpE
Mil-Spec

From L to R, as pictured
http://i64.tinypic.com/2uik5dy.jpg
Tubb Flatwire, Mil-Spec Rifle (not used in evaluation, as this was done with a carbine RE, shown for scale), JP tuned/polished, Sprinco "Blue", Geissele Super 42, Mil-Spec