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Posted: 11/5/2004 4:36:59 AM EDT
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Greetings all, I've decided to take the plunge and build one myself. I purchased a Colt M4A3 hbar complete upper and I have a few questions. First, this upper requires a "special heavy buffer "2" to prevent bolt bounce". Now where would I go about getting one of those? Additionally, what Lower would work with this? Any of them? Besides Colt, which would be most compatable, without any gunsmithing involved? I'm looking for basically "pop it together and go" configuration. Now, I'm not opposed to getting a stripped reciever and building that myself. And please, I know the controversy of buying a Colt. I don't want to get into that. I have no problem with any of the companies, as long as the products work! Help a newbie out ; I apprieciate any input/thoughts/advice. PS, I have read and re-read the posts concerning building. Great resource indeed! |
Since you asked nicely, I'll help you out  M4's operate better with an H or Heavy Buffer instead of a regular rifle one. It weights 3.77 oz. (sometimes a bit more if it's made by someone other than Colt) as opposed to 2.9 oz. for the regular carbine length and can be recognized by the "H" stamp in the front. Adco should have LMT ones in pretty soon or you can just search around on Brownells or Midway to see if you can find one. Any lower should work with any upper. I always tell people when they can't decide who go go with, what do you want engraved on the left side? A snake, a lion, a bear, an elk, a pony, or some logo? Practically all major manufacturers build their lowers to spec and they'll work with any upper. Just get a stripped one and a parts kit, then build it yourself. If it's not as tight as you want it, get an Accuwedge or Tension Pin and all will be good. |
| If you want to pop it together go over to eaglefirearms.net and check out their complete Stagarms lowers, high quality low price (same as Rock River Arms). You may be able to get a H buffer from them too. |
I'm guessing by heavy buffer '2' they're referring to the H2 buffer. The H2 weighs 4.7 ounces, while the H buffer posted by Caneau earlier weights 3.77 ounces. You could most likely get by with the H or the H2, I'm running H3 5.6 ounce buffers in all my carbines with great success... You can find H3 buffers at Fulton Armory, listed as 'Colt tungsten heavy buffers'... Bolt bounce is really not an issue in a semi AR, but the heavier buffers do smooth out the recoil impulse and gas 'spike' of the shorter gas system and delay unlocking of the bolt aiding extraction as the chamber pressures have more time to equalize... More heavy buffer info: www.ar15.com/forums/topic.html?b=3&f=12&t=207027 edited to add:
Like this?  ArmaLite... |
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Full autos have bolt bounce problems not semis, so ignore everything who ever told you that says from this point on, unless you are putting a collapsing stock on a 20" Hbar there is nothing but a std. buffer, unless you want to go Hydraulic or Pneumatic. If it's a current production Colt upper with the std. .250 front pivot pin then any brand of lower receiver should fit. |
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