1/2x28 9mm Muzzle Brake, Black Anodized, 10-degree, for Glock 17/19 width slides

Description

This is a high quality, aluminum muzzle brake compensator.  It is made in the USA (Minnesota actually).
Features include:
9mm and .380 caliber
vanes angled 10 degrees back to match some slide geometries
threaded for 1/2"-28 tpi right handed threads (most common 9mm threads in US)
Loosen and tighten with 2 screws for easy on/easy off
COUNTER-BORED: this feature on the slide facing side lets the brake get closer to the slide to make the gap smaller!  (see picture of the side view)
width is sized to match the Glock 17, 19, and 26 (1.00" wide - measure yours to see if it will match)
flush with the top of the glock slide
distance (or gap) from the front of the slide depends on your particular barrel but is reduced by up to 1/16" because of the Counter-bore.
add roughly 0.89" to the length of the barrel (however far out yours sticks)
Made of 6061 Aluminum
Anodized black, hard coat type III
held on with #6-32 x 3/8" socket head cap screws
tighten set screws to 10-12 inch pounds
This reduces felt recoil for competition, or duty.  Works better with higher grain/higher power loads (they have more gas to push back against the brake with).  In some cases, very light gamer loads will not cycle the action unless springs are changed out.
Set screws are tightened with a 7/64" allen wrench. On screws this small about 10 inch pounds is all the tighter you want to get them.