1 screw low profile gas block needed

[kookadala]

I have a MRB 300 blackout 15" fluted barrel. Beneath the gas port section of the barrel (carbine length gas tube) there is a deep groove in the front (muzzle end) of the gas block portion of the bottom of the barrel, situated perpendicular to the barrel. I assume this is for the gas block set screw. However, I tried a low profile gas block with two set screws and neither of the screws line up with the groove. I have been unable to find a gas block that only uses one screw, and there is no dimple on the barrel behind (breach end) the groove. I have read about clamp on gas blocks but would like to use a gas block with a set screw so it cannot move like a clamp on type could. Does anyone make a gas block for this barrel (low profile so I can install a 15" handguard)?

[Airhasz]

Post some pics.

[GH41]

Isn't the MRB one of those bastard LMT monolithic receiver piston rifles. You gotta put up a picture.

[kookadala]

Isn't the MRB one of those bastard LMT monolithic receiver piston rifles. You gotta put up a picture.

barrel.jpgbarrel1.jpg

This is the barrel. there are no markings on it other than 300 blackout 1/7. The label tag says MRB, I bought it at a gun shop in Salt Lake City. Yuou can see the deep notch on the gas block portion of the barrel (0.75" diameter)

[Iraqgunz]

That is designed to be used with a gas block that would be pinned (like the Geissele Super Gas Block). It's usually only done when mating it with the correct gas block. Sounds like you got some bargain bin barrel from the LGS.

barrel.jpgbarrel1.jpg

This is the barrel. there are no markings on it other than 300 blackout 1/7. The label tag says MRB, I bought it at a gun shop in Salt Lake City. Yuou can see the deep notch on the gas block portion of the barrel (0.75" diameter)

[Clint]

Yes, that barrel appears to have been made for a very specific gas block, probably from the same mfg.

Ask the store if they have the matching gas block that goes with it.