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Posted: 1/25/2008 7:29:37 PM EDT
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I need to lower the ROF on my RDIASed 9mm AR15. Besides saving a little on ammo costs, the lower ROF will make shooting singles easier, which will help in the subgun competitions that I shoot occasionally. I haven't timed the ROF on it but my seat-of-the pants calculation (comparing it to my Uzi) puts it at 800-900 RPM. From what I can gather, the only real way to slow it down is to get a different buffer. Both the MGI rate reducing buffer and the AAC CSMK II claim to lower the ROF. Who's used these, and which would you recommend? I'm going for the AAC right now, merely because of price, but if the MGI is better I'll go with what's better. Do either have moving parts in them that wear out/need to be replaced or adjusted? |
Sorry, misread your first post. Anyway, I think you'll see some further reduction with the MGI, but not as much as when swapping it with, say, a H buffer in 5.56 application. As to parts wearing on the MGI, the only thing that can possibly go less than forever on an MGI RRB is the roll pin. Mack Gwynn told me this could happen at around 50k rounds, based on their product testing. But the pin is easily obtained at about any hardware store and is a DIY replacement.........provided you can operate a punch and a hammer......heck, even I could do it.  Sam |
My 11.5" M16 went from 850 to 900 RPM to about 750. Pretty decent improvement. |
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If you plan to use the buffer with 9mm, my first choice is an Endine (SP) hydralic buffer and the lighter spring that comes with the AAC RR buffer. I find that the 9mm has a "sharper pulse" because of the straight blow back. The hydralic buffer seems to smooth that out. I have three of the MGI RR buffers that I use with the standard spring with rifle calibers. The MGI will reduce the rate with 9mm but I don't think it is as smooth as the hydralic buffer. The lighter spring also helps slow the ROF but since it is weaker can be problematic to strip the top round from a full rifle caliber magazine. Since the 9mm pistol case is so much shorter the lighter spring doesn't seem to have a problem stripping the first round from either a 32 rd mag Colt mag with 30 rds in it or a fully loaded 9mm Beta C. If you are only going to buy one buffer the MGI will work best over all. But for me the hydralic buffer with the AAC spring can't be beat for 9mm. Of course "Your milage may very". I've also had problems finding a magwell adapter that worked best. I ended up getting a Colt 9mm lower and removed the sear block. M60Joe made me an over sized hammer and disconnector from standard F/A parts. The .169" pins are a little stronger than the standard pins. The Colt lower works well with my sear. Another suggestion you might want to concider is a JP Enterprises single stage trigger. It lightens up the pull. I also find with no over travel, I can get off the trigger more quickly. That seems to help me get singles more often. Good luck with your project. Scott |
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