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Posted: 12/26/2013 2:13:32 PM EDT
| I'm just about finished on three new builds and am looking for help on selecting the right buffer and springs for each rifle. Currently on hand I have a BCM H2 buffer and a mil spec carbine spring. I want to use springs from Springco and BCM or Spikes buffers. The rifles are a 16" upper with a carbine length gas tube, a 16" upper with a mid-length gas tube and an 18" upper with a rifle length gas tube. Any help getting the right buffer/spring combinations for optimum performance is greatly appreciated. |
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Sprinco has there recommendations online. I would trust and follow them
Sprinco THE MOST COMPREHENSIVE SOLUTIONS IN THE INDUSTRY FOR OPTIMIZING THE PERFORMANCE OF YOUR BLACK RIFLE/CARBINE "WHITE Spring" STANDARD Power Buffer Spring. Equivalent spring load to a “fresh” Mil-Spec M4 Carbine Spring. This spring will perform reliably in any properly configured and maintained 5.56 Carbine, if you wish to maintain the performance of a “fresh” Mil-Spec load spring without concern for replacement. This is the best choice for shooters and purists that wish to maintain the performance of most factory supplied NEW Mil-Spec springs, but do not wish to be concerned with frequent replacement of same or do not have the time or inclination to seek enhanced performance options. The WHITE spring is recommended for 10.0"-11.0" SBR's with H2 Buffers, 1st Gen M&P's, older RRA's under 18"+ BBL's, most Colt 6920 LE's, 5.56 & 6.8 SPC 7.5"-8.5" BBL Piston Guns with H2 Buffers, All (Known to Date) .300 BLK Platforms and when training with SRTA and other low power and light charged “budget” rounds. Color Coded WHITE. “BLUE Spring” ENHANCED Power Buffer Spring, Offers improved performance with most non-suppressed 12.5"-14.5" SBR's, 16" DI Mid-Length BBLS, and all mid-length uppers with adjustable gas blocks. Best performance is usually achieved using buffers ranging from ST-2T, H2, DPMS Extra Heavy Buffer. Will run in 18"+ Length BBL RRA'S with ST-T2 Buffers, and some Colt 6920 LE's. Use of heavier buffers may not be possible with the aforementioned as well as most uppers with light weight carrier groups (VTAC, etc.) Color Coded BLUE. “RED Spring” EXTRA Power Buffer Spring, Best option for 16"+ 5.56 barrels with carbine length gas system platforms with standard front sight towers and H buffers, 16" + BBL gas piston guns, *some* suppressed shorties, and 9mm, 6.8 SPC, 6.5 Grendel, .458 SOCOM, 450 Bushmaster, .500 Beowulf, and assorted "Thumpers" using standard 7" depth M4 extension tubes. AR-10 Carbines (E.G. Armalite, Noveske, LMT) using deeper extension tubes and standard length carbine buffers to accommodate the longer .308 BCG also use the "RED" Spring. Please call us to discuss successful "recipes" for implementation of the RED spring in .308, 6.8 SPC, etc. RIFLE length extension tube platforms. Color Coded RED. NOTE: NOT for use in .308 Carbines using standard 7" M4 extension tubes and short, stubby buffers. (Use our "ORANGE Spring" below for that specific 9+platform approach application.) "ORANGE Spring" The ONLY specifically engineered EXTRA POWER Buffer Spring for .308 Carbine Platforms using standard 7" Depth M4 extension tubes and .308 short 2.5" buffers (Including aftermarket "heavy buffers.") You cannot clip coils from any other commercially available buffer spring to yield the proper spring loads for this application, especially in heavily gassed .308 carbine platforms. We started from scratch on this design to provide Operators with a viable alternative to existing OEM and aftermarket offerings. Platforms known to exist using this approach include DPMS, Bushmaster (Post 2010), Remington, CMMG, Mega, SA Defense, Colt 901, Rock River Arms and many others. Color Coded ORANGE. "GREEN Spring" In addition to use in 5.56 Fixed Stock Rifles, our “GREEN Spring” is just the ticket for use in the VLTOR A-5 Stock System using their standard weight (5.2 Oz.) buffer for maximum versatility with almost any 5.56 upper BBL configuration, both with or without a “can”. Color Coded GREEN. Buffer is inserted into color coded end of spring for fast I.D. of installed spring by Operator. If unsure which spring you should order, please call Tech Support at 866.515.AR15 (2715) and we'll be happy to assist you by sharing the best known "recipes" for your specific builds. |
| Personally I would stick with the standard BCM carbine action springs and buffers. H2 for carbine. H or H2 for the middy. Standard or H for the rifle. Get a cheap carbine buffer so you have 3 steel weights to play with. I had a Larue spring, which I believe is made by Springco, it sucked and I chucked it. |
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