Very nice! Does the light ever get gunked up being that close to the flash hider?
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ehr & msr: It's a Robinson XCR. I had Alex cut a heavy profile 12" bbl. back to 11" and then turn it down to a light profile. The gas block shoulder sits at 9" so the shortest reliable bbl. you can use is an 11". He is in the process of making a shorter piston/op-rod and when he is finished he will turn an 8" light barrel in 6.8 SPC for me. I will have to mill the top rail back 2.5" to accomodate the gas block but what I will end up with is an 8" PDW in 6.8 SPC. The side and bottom rails will terminate at the end of the barrel giving the PDW that MP5SD look. As it is now the ballance is better than my other SBR'd AR's and the adjustable gas system allows me to tune it for the least amount of recoil for any ammo I am using. I shoot 2k or 3k rounds between cleanings and probably could go much longer than that as it doesn't get very dirty with the piston set the way it is.
MadDog :p
http://img.photobucket.com/albums/v2.../SBRXCR002.jpg
http://img.photobucket.com/albums/v2.../SBRXCR010.jpg
Here's my .22 SBR, using a 7.5" Kuehl barrel and a Millet 1-4x scope. The muzzle ends right behind the end of the handguard, so I put a Phantom flash suppressor on it for now. I realize the scope looks sort of goofy with it sticking out so far towards the muzzle; my plan is to get a QD F/A capable .22 suppressor to use with the gun, which should help balance it a little more.
http://img520.imageshack.us/img520/4...22lrsbrid1.jpg
Okay, so maybe I lied. :D
http://i153.photobucket.com/albums/s.../DSCF0816a.jpg
MadDog, how well does the XCR do with the can? Any of the blow back issues like with an AR? Is it as quiet as a suppressed AR (or close?) I've heard they are a little louder. I was thinking about doing a similar build to what you have there.