Quoted:
I strongly recommend against both. Either save up for a REAL DIAS ($4000), or save up a bit more and buy a $3000 Vector Uzi, which is 5 times the gun a Mac 11 is.
A LL makes your gun full-auto-only, and will need to be fiddled with a lot to keep it working. There's no way I'd pay $2500 for $1 worth of steel.
And a Mac is virtually worthless as a weapon. Cyclic rate is WAY too high, and will empty a mag in a bit more than 1 second. This will be fun once or twice, but you won't hit anything and will get REAL tired of filling those mags. An Uzi is far, far more controllable.
-Troy
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Mark this day in history kids - I get to contradict Troy and not sound like a total buffoon. I'm sure this won't happen again. [:)]
The beauty of an M11 is that it is a fun little bullethose. Add a Mac-Jack buffer in there and you can push the cyclic rate from about 1100-1200 on a stock, out of the box gun to about 1800rpm. Can you say "WHEEEEEE!!!"
Of course with a few mods, you can make the Mac go the other way too. The Urbach heavy bolt, the Garrison VSF upper, an op-rod and an AR15/M16 buffer and stock, are all mods which will slow the rate significantly. Even the simple addition of a semi-auto hammer in a M11 will slow the rate another 100-200 rpm. With these mods, you can get an M11 down to 600rpm or less. On several occasions at the NFA nationals, modded M11's came in 1st - beating shooters with MP5's, M16/9's, Uzis, and Swede K's. I haven't kept track of the AC3A matches, but I think Tony G. will back me up that a properly modded M11 can be a decent weapon and competitive with much more expensive guns. The most expensive of these mods is the Garrison kit at about $500. But at $1500-1700 for a complete gun with a Garrison upper, its still about 1/2 the price of an Uzi. Bottom line is they are fun little guns and can be inexpensively modified to be more competitive. That doesn't mean an Uzi isn't a good weapon - I've got one, they're great - but with a little work you can get the same kind of performance out of an M11 for less money.
I do agree with Troy on the link - you'd be better off waiting and saving a bit for a DIAS or a registered receiver M16. Considering you already have one supressed M11 on the way, I think that would be the best way to go.