I searched for this previously on here with no results, maybe my search-fu is off, my apologies if it is.

Those of you that read my previous post might have noticed I mentioned that my rifle is overgassed but what I didn't mention is that at some point in the future I'd like to get a suppressor and an adjustable gas block might come in handy but i'm broke at the moment and I like to tinker.  Why buy when I can build?

Well, onto the guts of this post.  Most of the DIY ones are either tapped in the side and directly restrict gas flow between gas port & gas block and yet others are tapped from the front.  I have two questions regarding this, 1, for the side tap, does the screw only contact the passageway or will the tube be drilled?  2, with the front tap, does that also directly restrict the passageway or is there a section that goes into the gas tube?  Not all designs are the same and the holes are sometimes in different spots.  maybe the user that likes cutting ammo in half has cut an adjustable gas block in half?  LOL, not holding my breath for that though.  Those of you that have one might be the most insightful, though I'm sure there are some engineer types on here that may know also.  Any help would be great

Hope this helps

https://www.ar15.com/forums/ar-15/DIY_Adjustable__Low_Pro_Gas_Block/118-625059/

https://forums.brianenos.com/topic/79793-anybody-make-your-existing-gas-block-adjustable/

http://castboolits.gunloads.com/showthread.php?332785-DIY-AR15-Adjustable-Gas-Block

Thanks for, I saw some of those but not all.  I emailed the poster from here, hopefully they have some clearer pictures.  Ijust don't want to screw up.  Hopefully I can find a cheap .750 lo-pro block here on EE so if I do screw up I'd still be able to shoot

https://www.ar15.com/forums/t_1_5/2146304_That-Every-Man-Be-Armed-Free-AR-parts-Please-contribute-your-old-parts-.html

https://www.ar15.com/forums/AR-15/-Pay-it-Forward-thread-If-you-have-small-parts-you-wish-to-donate-Post-here-/4-730041/

These adj gas blocks go on sale for $19.99 at primary arms. You could drill and tap your own just like it but even a decent low pro gas block cost $20.

https://www.primaryarms.com/radical-firearms-low-profile-adjustable-gas-block-750-set-screw-style-rf-adj-750_2

I'm trying, posted over there a little while ago but if that fails, I found a chinesium one (steel) but we all know just how strong chinesium isn't

Seems like a good price but after looking at the reviews I don't know whether the people buying it are idiots or if their block has bad QC issues. I'll keep it in mind.  There's one or two local shops that have a good selection of AR parts, I'll see what they have in stock or if one of the smiths has some lonely lo-pros in the back

I did a few for pistols that were over gassed. It's easy and it works.

From teh side, drill through the channel between the barrel and gas tube. It needs to be a large enough screw to block most of the channel. I believe it was a 8-32 screw.



Used a lock nut on the screw. Use a socket to tighten the lock nut and an allen down the center of the socket adjust the gas.





This is before I opened up more space to insert the socket to tighten the lock nut. I wasn't too worried about this $25 handguard. Later notched the top of the allen head so adjustment turns could be easily seen.

Seems relatively straight forwards but did you have to mill a flat to get started or did you just step drill it?  It seems that the bit would want to wander quite a but in that spot.  I have another problem though.  I was going my AR to re-align my handguard & when I reattached the gas block the screws were stripped.  I didn't even reef on it!  I'm going to send them an email & see if they'll send me one.  Maybe if I tell them it's overgassed they'll send an adjustable one, worth a shot at least