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Posted: 11/16/2016 12:12:03 PM EDT
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I'm waiting on my WOA 18" spr barrel to come in to do my build and I'm researching everything I can on properly assembling this rifle to maximize the accuracy given the parts I have.
I've been planning on dimpling the barrel for a yhm set screw gas block. Seems to be a more secure way of holding it in place and keeping it from rotating it. Does drilling out material effectively reduce the rigidity of the barrel and decrease its accuracy? I've also read somewhere someone thought that possibly not putting the dimples actually put an inward force on the bore that affected accuracy. I don't want to degrade the barrel by installing dimples. Am I splitting hairs here? Also I can't seem to find a straight answer on if its better to do only 1 dimple for 1 of the set screws or do the two dimples for both set screws? Some say the two keeps you from using a different brand gas block down the line since it won't line up with the screw holes, which is a good point. I guess if you ever ran a suppressor and needed to install and adjustable that would be a concern. |
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Quoted:
My WOA 18" SPR barrel with rifle gas came pre-dimpled (2 dimples) for their gas block - .425 center to center spacing. Oh wow, maybe mine will have them then. I'm getting mind from adco because I wanted it coated black so I don't know if it will come the same as yours or not. that would be nice if it was predimpled and happened to work for my yhm gas block. I'll have to measure the distance between my set screws and I guess I'll have to see what the barrel is like when it comes in. hfrog55, thanks for your response as well. I figured I am probably splitting hair but I was hoping to hear from anyone that has done a lot of precision builds and what they do for the gas block. |
| tw: Much better to have WOA or ADCO do the dimpling than for you to try it at home. I expect your new barrel will already be dimpled when it arrives, most makers include that feature. Only the rear dimple, directly opposite the gas port, is necessary and it greatly simplifies the job of properly positioning the gas block. - CW |
| FWIW, set screws are cupped on the bottom. Look at them. They are designed to flatten and conform to the shape of the barrel when you "set" them. You really do not need to have the barrel dimpled. If you want to do anything, have a flat machined on the bottom directly under the gas port. That would be better than one or more dimples. |
Then its time to build this bad boy.
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Quoted:
tw: Much better to have WOA or ADCO do the dimpling than for you to try it at home. I expect your new barrel will already be dimpled when it arrives, most makers include that feature. Only the rear dimple, directly opposite the gas port, is necessary and it greatly simplifies the job of properly positioning the gas block. - CW Dimpling is easy, both with and without a jig. Factory dimples are nice (and OP's barrel will likely come with them), but in the event that it doesn't, it's not rocket surgery. |
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And the biggest benefit from dimples is alignment of the gas block. There's little extra "hold" from your setscrews seating in a dimple over being torqued into the barrel itself. And there are no real stresses on a block to move - unless it's outside of a rail and you toss it around a lot...
Just like installing a gas block, locating the dimples is easier with a jig. Someday I'll have to take some pictures of my "Cheap @ss Jig," made from a less than $10 Chinese aluminum block. Converting the aluminum gas block to a dimple jig was easier than locating my first setscrew block without dimples or a jig. |
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