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Posted: 1/14/2016 5:12:41 PM EDT
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Hello, this is my first post here! I tried using the search function (which I probably didn't do correctly) and browsed a few pages of this forum and didn't see my topic so here goes.
I'm planning on building an SPR-ish gun (not a "clone"....just an 18" accurized barrel). I'm wanting an 18" barrel (Rainier Arms Ultramatch), and a Magpul ACS stock...I'm trying to figure out what buffer/spring I need to use, as well as if I should go with rifle or midlength gas system. Accuracy is a huge priority, BUT second to reliability. I've heard people say there are reliability issues with 18" rifle gas + carbine buffer. So, requirements are: -18" Ultramatch Barrel + Magpul stock -Accuracy important, but second to reliability This isn't my first AR, but it is my first build. I understand the very basics, but am no expert. I've found all different answers, and I'm just wanting to know what someone who is very experienced would do if it were their gun. Thanks a lot!! 
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Sorry, I guess my question is what weight should I be using. Thanks! It depends on several factors.... I would probably start with H2 or H1. My 18" mid gas I run the Spike T2 or very close to the H2 in weight. You could also get away with just a standard carbine weight. |
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I have a 18" build in mid length that shoots very nice. Uses a carbine spring and buffer. I could of gone with a slightly heavier buffer like a H.
Found this in another thread.... According to some chart there are five (5) carbine buffers; 3.0 oz, 3.8 oz (H), 4.6 oz (H2), 5.4 oz (H3) & 6.5 oz (HSS). |
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Wow I'm glad I joined, you people reply fast! How exactly will I know what is "correct" or best per se? Mine I started out with a standard and my ejection was almost all straight forward so I dropped a spare Spikes T2 buffer in and my ejection moved to about 2-3 with M193/M855 and 3-4 with wolf/tula. |
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I would start with an H buffer. You probably wouldn't notice a big difference between a standard carbine and an H3 and all of them would most likely run just fine. Most 18" rifle gas barrels work fine the 5.4oz rifle buffer, they are probably a little over gassed for the lighter carbine buffers, but in the end they will all work. I start with H as that is mil spec for the M4. If you run full auto you may have bolt bounce issues with a standard buffer. These are generally solved by an H buffer, on rare occasions you need an H2. The only time I like to use a buffer lighter than the H buffer is with light weight carriers. ETA: IIRC they went to the H2 as mil spec for the M4A1. |
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Quoted: It uses a more heavily compressed rifle spring and more weights to reduce carrier speed whilst increasing return momentum. They are basically a softer shooting setup. It effectively lets you have a rifle weight buffer and standard rifle spring in a more compact collapsible stock configuration. IIRC the standard weight A5 buffer is the same weight as a regular rifle buffer. You can get lighter or heavier buffers to suit your needs. Most configurations are well served by the standard weight buffer. |
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I don't think that's right. It uses a standard rifle spring compressed the same amount as in a rifle stock setup. They then use a buffer configured like a carbine buffer, but longer. It effectively lets you have a rifle weight buffer and standard rifle spring in a more compact collapsible stock configuration. IIRC the standard weight A5 buffer is the same weight as a regular rifle buffer. You can get lighter or heavier buffers to suit your needs. Most configurations are well served by the standard weight buffer. Quoted:
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It uses a more heavily compressed rifle spring and more weights to reduce carrier speed whilst increasing return momentum. They are basically a softer shooting setup. It effectively lets you have a rifle weight buffer and standard rifle spring in a more compact collapsible stock configuration. IIRC the standard weight A5 buffer is the same weight as a regular rifle buffer. You can get lighter or heavier buffers to suit your needs. Most configurations are well served by the standard weight buffer. I maybe be wrong about the compression but that was my understanding. A5H0: 3.80oz A5H1: 4.56oz A5H2: 5.33oz A5H3: 6.08oz A5H4: 6.83oz All are heavier than equivalent carbine buffers. The A5H2 is the standard and the weight of an H3. Note that the CAR buffer has three weights/spacers, the A5 has four and the rifle buffer has 5. For an A5 buffer the number after the H, like in a CAR buffer, is the number of spacers that are tungsten. |
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I maybe be wrong about the compression but that was my understanding. If you look at a rifle buffer you will notice the extended part of it. The A5 tube is shorter than a rifle tube by that exact amount. So same rifle spring, same rifle weights, but short tube and buffer. |
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Because an adjustable gas block is a band air for a poorly ported barrel, and if you fuck it up you'll reduce reliability. Quoted:
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Someone fill me in... why all this buffer talk when you can recommend an adjustable gas block and move on? Because an adjustable gas block is a band air for a poorly ported barrel, and if you fuck it up you'll reduce reliability. I dont like that argument at all, but to each their own I guess. Its an SPR, not a SHTF gun. |
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I dont like that argument at all, but to each their own I guess. Its an SPR, not a SHTF gun. Quoted:
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Someone fill me in... why all this buffer talk when you can recommend an adjustable gas block and move on? Because an adjustable gas block is a band air for a poorly ported barrel, and if you fuck it up you'll reduce reliability. I dont like that argument at all, but to each their own I guess. Its an SPR, not a SHTF gun. An adjustable gas block used more for suppressed rifles then stock. ALSO Remember the OP asked a question about buffers, Based on his follow up questions. Throwing an adj block in the mix, gets more complicated then need be. IMO shoot the gun , see how it performs. IF the OP feels it needs a heavier buffer, change it out. There's more time spent trying to fix guns that are not broke. OR worse yet even fired, then actually shooting the thing. . Until i started running suppressed platforms. ALL my AR's ran stock internals, with no issue. |
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Someone fill me in... why all this buffer talk when you can recommend an adjustable gas block and move on? Get it running reliably with the correct buffer weight first (using wide open gas). Then OP can explore the option of an adjustable gas block for recoil reduction. |
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oh okay. Sorry for all the questions, last one (I hope!) With the A5 system, they offer various buffer weights. Should I still stick with trying Vltors H and H2 buffers? Yes either should serve you well. Only advice I can give you is based upon what choice of ammo you will shoot most often. If you plan to shoot cheap steel (Wolf Tula or anything steel Russian) the H should suit your needs no issue but if you plan to shoot NATO spec ammo M193/M855 I would just go ahead with the H2 but again either should work. |
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