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RP88, The M4 gas system is not the same as the old XM177 or CAR-15/16 gas systems. It is purpose built, when Colt was working on the project they subcontracted the gas system and the buffer spring and buffer assembly analysis used in development. The environmental testing chambers were tied...

Yakov, Don't abandon it, refine it. Just remember though, once the bullet has left the barrel you've lost most of your pressure and unless the bolt is already moving it won't just start moving unless it has a force applied to it. If you look at gas operated, recoil operated or even delay...

Yakov, Don't make the mistake in operation theory that many make and think a Gas Delay Blow Back Action is ever "locked." It's not, the very nature of being a "blow back" design which primarily operates from inertia precludes it from being a locked design as we know it. If you are trying to...

Feedthehogs, I had read something to that effect, I didn't know he was out of pocket though. Thanks... R.W., I believe you are right about that. The ML sabots are all (or the ones I find) Polypropylene which facilitates them being loaded. The centerfire .30 caliber sabots were usually...

R.W. Thanks... What caliber bullets? I have wondered if the .40 caliber bullets in a sabot would leave fragile petals. I have experience with .30 caliber sabots pushing .22 caliber bullets above 4,000 fps so I know they can work. This is why I am asking, I don't want to spend time sorting...

Does anyone have any experience with sabots in this cartridge? I know it sounds counter intuitive because we have gone to so much trouble to get a big heavy bullet on the AR platform, but I want to shoot a heavy bullet such as a Sintered Tungsten, a machined non-lead, a bullet without a...

SBR has Brass in stock. 300 rounds for $241.40 that includes the $14.60 for shipping. That's cheaper than buying it directly from Starline. SBR sells it in 100 round increments and Starline has a minimum of 250 rounds. http://www.sbrammunition.com/brass.html ~Mako

Ohiochief, The distance from the eye to the aperture is the magic behind that type of sight. If you have another AR or have a friend that has one. get a tape measure and sight down the alternate rifle, have someone measure from your nose to the sight. Now set your RRA to the same distance...