Posted: 3/14/2008 8:12:01 AM EDT
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Dumb question. For a 9mm lower build, is the usual/only? way using a drop-in conversion kit such as the one sold by Brownell's? Mag well insert, hammer, recoil spring, buffer. Is there anything reliable out there that would allow for a quicker change over from .223 to 9mm? Don't flame me with the whys and why nots. I'm just askin the question. |
When you say "drop-in" do you mean that literally? There are a few variations of mag well adapters and one actually did drop in from the top. One is inserted from the bottom. The other are the two piece that are inserted then riveted or secured in the mag well. For the fastest change over I would just run a DPMS style AR hammer (no notch) and a one piece mag well. The heavier buffer will be good for both calibers. |
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You need a mag block at the very very least. If you get a drop-in top loading mag block like the Hahn, get your 9mm AR bolt ramped, use a DPMS-style no-notch 223 hammer, a regular recoil spring, and a H1 or H2 buffer, it might be okay. To switch, you would remove the 9mm upper, slip out the top loading mag block, and put on the 223 upper. The hammer, recoil spring, and buffer would remain in place. I don't have this setup so I'm not sure how reliable it would be. Also, you won't get BHO with that mag block. Personally, I think 9mm ARs are finicky enough that you should dedicate an entire lower for it. Assemble it, tweak it to get it to run reliably, and then leave it alone. my two cents. |
Or buy a MP5 clone. |
just kidding, don't get mad at me.
Have you looked at the Olympic Arms PPC (pistol caliber carbine) product? Their product (barreled upper receiver, BCG, etc.) mates with a standard lower. No need to change hammer, buffer, or springs. Their magazines are modified and don't require a mag well insert. Quick change? Just swap upper assemblies - takes what... 15 seconds? Reliable? Mine runs perfectly, used at monthly matches when even the slightest hiccup would cost time/score and piss me off. Others I've spoken with who use the Oly PPC product have been quite happy with it. I see it used in competition frequently. YMMV Good luck, ac |
$1000-$1500 for a clone Coharie is the new name for Todd Bailey's operation. Todd makes the most common MP5 clone receiver. All other MP5 clones are made with his receivers, including Vector and Bobcat. Avoid Vulcan, those are horrible. MP5 clones get a bad rap sometimes, but once you get them to work, they are fun. Sometimes you'll need to replace parts with factory HK parts, sometimes you won't. I have a recently made Cohaire clone and it's been pretty reliable through about 200 rds. |
I didn't want to spend that kind of money. With the parts I have, the kit from Brownells @ $200, and an upper, I can put one together for about $550. |
There is one on the boards for $900 |