RacerX

They are fine for measuring purposes(which is all I intended in my post), but I certainly wouldn't recommend them for actual drilling. @HarveyshotNotice what I linked to are numbered drill bits. They have more iterations of sizes between the "normal" drill bit sizes, which is why they're good for measuring gas port holes. Link to drill bit chart showing "regular" and numbered drill bit sizes.

I wouldn't recommend that. I just ran into two barrels from Ballistic Advantage that were undersized. If you have a Harbor Freight(or some other cheap hardware store) nearby and $20 to spare, you can pick up one of these to use for measuring. Numbered drill bit set

Thank you. I was pretty sure, but wanted to be completely sure before drilling.

Tagging @98Z5V as I think this might be a gas port issue. Background: I just assembled 2 new identical 308AR rifles. They have all the same parts as the previous one I built, which fired perfectly after I changed to the Sprinco spring/KAK buffer combination. But, I never measured the gas port on the previous build, so I wonder if it may have been larger. When measuring these two barrels, they definitely seem to be at the low end of the acceptable range, but want to ask here before doing any drilling(and get a size recommendation). Issue: Both of these rifles are exhibiting the same issues. The first 5 or so shots worked fine. After that, I have had failure to feed after almost every firing, failure to eject on a few, and 2 stovepipes. Ejection angle is consistently at 4 o'clock. I decided to stop after about 20 rounds, as this seems to be more than just a "needs breaking in" scenario. Waterboarding Info: 1.) Do you have Armalite AR10 Recoil System: No 2.) buffer weight 5.1oz (KAK LR-308) 3.) buffer length 2-1/2" 4.) Extension Buffer Tube internal Depth 7" 5.) What Spring, Length, Coils, Brand, Color Brand: Sprinco Orange Length: 11-5/16" Coils: 29 6.) Gas System Length- Rifle, Midlength, Carbine, Pistol, Other? Rifle length 7.) Gas tube Length 14-5/16" plus portion inside gas block (approximately 15-3/16") 8.) Photo looking directly into the magwell 9.) Photo of the Bolt Face 10.) BCG Clearance at the ears and bolt stop 11.) Gas Journal Diam and gas Port Diam Gas Journal: .750" Gas Port: Go: .0860" No-Go: .0890" 12.) Photo and Description of the Malfunction or Issue Issue described above 13.) More Photos n/a 14.) Additional Information Upper: Aero M5 18" .308 CMV Complete Upper Receiver w/ ATLAS S-ONE Handguard Barrel: Ballistic Advantage Lower: 80% Arms BCG: Aero 308/7.62 with 9310 bolt, black nitride Magazine: Magpul PMAG 20 Ammo: 175gr Bullets 1st .308 Win hollow point 178gr Hornady .308 Win Hornady ELD-X Lubrication: It is sopping wet.

Waterboarding thread

Actually Sammy Hagar's, and he still owns it. Cabo Wabo

Aunt Jemima is dead. Quaker Oats and Pepsi killed her.

The spring difference was the very next thing I would expect as well, pending all measurements are the same. Does the drum act any differently half-loaded versus fully loaded?

The same technical specs section you pasted from. Looking at it a second time, I do see now where they say it is compatible with DPMS LR308... I skimmed right over that the last time. Sounds like they need to update the "not compatible" caveat section. I wonder if they actually tested (or had customers report) on the other brands, like 80% Lowers, 5D, Modulus, etc. The incompatibility is definitely curious. I would grab a dial caliper and start taking some measurements to compare.

I would look at the difference between the drum and the magazines and see if something (e.g. shave a little off somewhere) can be modified to make it work. Looking at the technical specs, there's a whole lot of things it's incompatible with.

You might also want to include what ammunition you are shooting. That's not one of the waterboarding questions.

I bought this AK-style 12ga from Rural King for $400. It is an exceptional gun for the price. It even has an adjustable gas system. It will accept a ProMag drum with minor modification. JTS M12 AK

Thanks everyone for your input. Here is how mine came out. It was Cerakoted in the following colors: Patriot Brown, Magpul Foliage Green and Cerakote Desert Sand

Here's a thread I started a while ago, asking for examples of camo examples: Camo photos I actually should update that thread with mine, now that it's done.

Let us know if you figure out how to do that. I went to the web page and I couldn't find anything "clickable" to order it. AR-10 6 POSITION RECEIVER EXTENSION KIT (NO STOCK)

It is amazing, and thank you for providing me that link. I took the time to compare AR-15, 80% 308 and CMMG 308 catches and dimensions B, C and D are different, with D being most interesting as the 80 Percent pin height (D) is higher than both of the other two catches.

I put a little piece of paper on the magazine so you could hopefully see it better.

Yeah, I was hoping you could see in the photo - it does stick out there. The green of the magazine is almost the same color as the gun, so it may look like the magwell to you.

I also have an LPK from CMMG, so I decided to compare the bolt catch between the two kits. Some of the dimensions are different, but I believe the "ear and the tooth" (sorry, I don't know what proper term might be) are still in the correct location. Mostly it appears to be less beefy. I can dig out my calipers and take some dimensional measurements, if you like.

It is from 80 Percent Arms. I'm not sure if they make it themselves or if someone else does. I have several LPKs from them, so I dug a few more out, and they were all identical. The only identifying mark on it is a triangle in a circle: There's no mag in there, but even if there was, that bolt catch won't reach the magazine. Here is a photo with the magazine inserted. It worked fine for 3 or 4 bolt-hold-open tests. What's pushing that bolt catch up right now? It's hard to tell in the photo, so I tried to outline where a corner/edge of the bolt catch and the bolt are jammed together.

Yeah, I was testing image insertion between text, not after the text. Most BBS's have a simple button you can click to insert images in between (or after) lines of text, but this one doesn't. I figured out that I could drag an image from my computer into the post and it would insert it at the right place, though.

Oh, now that's interesting. As far as the "cure" went, did you just let it sit at room temperature for x number of hours? Do you think without baking it is less/same/more durable than spray paint?

I'm testing a new 308AR build - testing firing, ejection and bolt hold open. I would load 2-5 rounds per magazine to test this. Everything seemed fine until the last round in one of the magazines. The bolt has jammed up against the bolt catch. I wonder if there's something in particular I should look at, or if this is one of those "keep firing to break it in" situations. Also - should I use a punch and a hammer to push the bolt backward, or is there a better way to free this up? Waterboarding info: 1.) Do you have Armalite AR10 Recoil System: No 2.) buffer weight 3.79oz (107.6g) 3.) buffer length ~2-5/8" (2-19/32" actual) 4.) Extension Buffer Tube internal Depth 7" 5.) What Spring, Length, Coils, Brand, Color Brand: 80% Arms (part of their 308 LPK, actual manufacturer unknown) Length: 11-1/2" Coils: 28 or 29 6.) Gas System Length- Rifle, Midlength, Carbine, Pistol, Other? Rifle length 7.) Gas tube Length ~14-1/4" + portion inside gas block (Aero complete upper, haven't disassembled) 8.) Photo looking directly into the magwell 9.) Photo of the Bolt Face Photo not taken yet, as bolt is still stuck. 10.) BCG Clearance at the ears and bolt stop Measurement not taken yet as bolt is stuck 11.) Gas Journal Diam and gas Port Diam Measurement not taken yet. This is an 18" Aero M5 upper, I will search to see if someone else has already posted that information in another thread. 12.) Photo and Description of the Malfunction or Issue As described above, the bolt is stuck against the bolt catch. 13.) More Photos 14.) Additional Information Upper: Aero M5 18" .308 CMV Complete Upper Receiver w/ ATLAS R-ONE Handguard Lower: 80% Arms BCG: Aero 308/7.62 with 9310 bolt, black nitride Ammo: 180 grain Remington Core-Lokt

Looks like it worked correctly.

This site doesn't have a place for testing posts like this, so this subforum seemed the best choice. I'm testing to see if there's a way to insert images inline (the usual icon doesn't appear in the menu bar) or if I will have to partially post, insert an image, edit the post and then continue on with more text. Line 1, testing to see if image gets inserted after this. Line 2