To have the sight block recessed to the gas block could only use a shroud of 7" (7 - 1/4" Max.) in length, while those that would want the sight removed completely could stretch to 9" (9 - 1/4" Max.)
The barrel exposed barrel is approximately 9 - 5/16" from the gas block to the muzzle, and the factory sight block is 1.960" in length. The barrel beginning at the gas block is 0.590" in diameter, and tapers to 0.588" just before the front post. The last 1.990" before the threaded portion is turned down to 0.565". Those looking into recessing their sight block will need to increase its internal diameter approximately 0.025".
Other forums I've researched this on has stated this may not leave enough material to be as structurally sound, so I have opted for a new sight with a factory internal diameter of 0.590". It just came in the mail today, I'm about to pick it up.. I'll let you guys know how it seats when I get home.
Had to invest in a proper 12 ton press to remove the old sight block, but the new sight slid on a bit too easy. I drilled tighter grooves into the barrel, so the pins have made it very snug. The new post is about 5mm taller, which can be compensated by bringing the post farther down and the rear sight higher. I set this sight to be almost exactly where a factory front sight block will sit recessed to the gas block. 7 - 1/4" barrel exposed.. 7" to 7 - 1/8" shroud would be perfect to keep from marring the sight.
Any updates on fake cans for AR's BBB?
NFA/CSSA Member since the Swiss Arms and CZ 858 Reclassification!
If I get a cz858 that over barrel looks like a good idea if it's not to pricey
Exciting! Can't wait to give you my money.
NFA/CSSA Member since the Swiss Arms and CZ 858 Reclassification!
$30 flashlight from Home Depot, two drills and a zip cut. A good temporary shroud