.625 c!amp on gas block?
- Thread starter BioPace
- Start date
Not sure about a clamp on .625 but curious why you don't like set screw style? I've never had one loosen up or move and almost all my AR's over the last few years (many rifles) have had the set screw type.
Give Tier One Armoury in Edmonton a call, they may be able to track one down for you.
Give Tier One Armoury in Edmonton a call, they may be able to track one down for you.
The set screw can deform the barrel (it's thin and probably ####ty metal) as mentioned, and also I've see barrels where the set screw has moved because the barrel wasn't dimpled.
I don't have a dimpling jig, and I'd rather do it right.
I just missed delivery of the barrel and I'm not in a super big rush to put this together. (But at the same time in a rush in that 'i want a new gun kind of way').
True North Arms has one: https://truenortharms.com/products/maple-ridge-pincer-gas-block
Excellent and fast service.
Excellent and fast service.
Yup. But not dimpling is also not installing it properly. Not trying to have an argument about the merits.
Thanks - that's the Maple Ridge Armoury unit I'm trying not to buy.
Fair enough, just letting you know that both can wreck a barrel if improperly installed. TNA has generic clamp ons, I had seen another vendor with one, I’ll post it if I find it.
Edit: they were all .750, sorry. Good luck with your search.
Last edited:
I second this.
- Location
- Red Deer, Alberta
While I've never tested it myself, I have read in a couple of different books about accurizing the AR15 & read on forums with people who have a lot more experience than myself that the clamp on style of gas block is preferred if you are trying to get every bit of performance out of your barrel. Also gunsmiths who make a living in the US by selling super accurate AR15's all seem to use the clamp on style gas blocks.
Being a machinist apprentice and having spent more time in a Dimension Metrology lab than I'd like, I can see where the claims come from. The set screw would imply a slight bending force in the barrel, causing perhaps a POI shift. I bet for 99.5% of AR15 users this would not be an issue at all, but if you are trying to make the smallest groups possible it is something to consider.
Being a machinist apprentice and having spent more time in a Dimension Metrology lab than I'd like, I can see where the claims come from. The set screw would imply a slight bending force in the barrel, causing perhaps a POI shift. I bet for 99.5% of AR15 users this would not be an issue at all, but if you are trying to make the smallest groups possible it is something to consider.
It’s not like you can see it lol, it’s measurable with machinist type tools (micrometers and such). It usually isn’t enough to stop a bullet, but it can effect accuracy and wear points in the barrel.
I use a lot of 'machinist type tools' at work daily (
) and I'm honestly skeptical about the level of deformation that the gas block set screws are going to impart on the barrel. The amount of force required to get a #10 (#8?) set screw to crush/deform (not simply mar the surface) a 32rc barrel is more than likely going to strip the hex or allen key before you get there.Regardless, I like clamp-on gas blocks better than set screw.
Last edited:
