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I have (possibly because I am mentally addled) decided that I want an AR 45 upper, and am looking into building it myself (see previous comment, re: mentally addled). In my research, I have come to decide that I would like to go with the CMMG radial delayed blowback architecture, and am...

Short version: I played musical barrels with a pair of Howa actions/barrels, and installed a .308 barrel that began life on action X onto action Y, and not only was the head space in spec, it was tighter than a nun's.... habit. Go gauge went in and chambered without a hitch, while the bolt...

Here. It's kinda long and dry, but contains a lot of really good info regarding terminal performance of handgun ammo. I will say that the discussion focuses on self defense ammo, and therefore their comments pertain to human targets (and human target analogs like organic ballistic gel), but the...

Okay, I'm probably going to start a shitstorm with this... but I really don't understand being a big fan of 6mm chamberings. It seems to me that if you're target shooting and simply looking to make hits, that projectiles in the .224 diameter offer better drag numbers (grain-for-grain), and if...

Brownell's for $249. Hunter (light) weight barrel, but get while the gettin' is good.

Long story short, if you plan on installing a SiCo 11/16-24 ASR mount, be aware that the wrench flats on the brake are pretty much perfectly fitted by a 22mm wrench. Nominally, SiCo probably intended for users to use a 7/8" wrench, but 22mm was a much tighter fit. Short story long, I got this...

Long story short, I have a Ruger American Ranch (chambered in 45 Raptor...-ish) that I dropped into a Boyd's Pro Varmint stock. In a lot of ways, the fit is great... the barrel channel is correctly shaped (if somewhat odd looking with the wide fore end of the Pro Varmint and the relatively...

In my 450 Bushmaster/45 Raptor bolt gun saga, I have decided that there aren't enough .452 (450 BM/45R) diameter rifle projectiles to make me happy, so I'm playing with swaging down some copper jacketed .458 projectiles; specifically, some 325 gr Hornady FTXs. After swaging them down in two...

So, we all know that it's a bad idea to run lead bullets through a sealed can, but what if they're gas checked? In case you're unfamiliar, gas checks are these little copper caps that go on the ass end of cast lead bullets, and are there to allow for higher pressures to be run without resulting...

Short story long, I am in the final planning stages of getting a bolt gun currently chambered in 450 Bushmaster re-chambered to 45 Raptor. The cartridge diagrams are below. The 'smith that I contacted about re-chambering said that he'd do it, but that expanding the base of the 45 Raptor case...

In a fit of brilliance/moment of stupidity I have decided that I want to re-chamber a Ruger American Ranch rifle in .450 Bushmaster to 45 Raptor. Since it has been brought to my attention that the 450 BM case has a bit of taper to it that is not shared by the Raptor, I'm thinking that in regard...

I'm generally not a fan of SFP optics, but it's something I can live with in certain cases. A sub-$400 optic out of Japan with illumination and a 56mm objective is one of those cases. My intended use case is on an upcoming bolt gun build in 45 Raptor (think 460 S&W Mag with a rebated rim). My...

My latest brainfart is that it sure would be fun to take one of those Ruger American Ranch rifles chambered in 450 Bushmaster and run a 45 Raptor reamer into the breach. So far as I can tell, they're both straight wall cases intended to run .452" diameter projectiles, and offer a standard/.473...

Looking at the announcement for these variants of the MDR, I have to admit (as a '19 MDR owner) to being envious of the higher durability polymer; I haven't had any issues, but more stronger is more better. Regarding the trigger, I have the JARD sear assembly in mine so the upgraded trigger...

I'm not sure if this is the right sub-forum to post this, but here goes, anyhow... Some time back, I purchased the 5D Tactical jig and a couple of their 80% AR15 lowers. I have been sitting on it for some time, trying to get the machinist at work to do whatever sorcery needed to be done to get...

...so, I am going to preface this by saying that I am first and foremost, an utter amateur in the world of semi-automatic firearms. As such, I may communicate thoughts or concepts that are ridiculously simple or even completely wrong; and for those of you who have more knowledge/experience than...

So, this certainly isn't anything that people couldn't figure out for themselves, but since I took the time to do it, I figured that I'd post up about the tooling/process to convert "standard" (5/16-24 threaded) bolt knobs to be compatible with the ARC bolt knob attachment method. NOTE - ensure...

It seems that there are relatively few MDRs chambered in 5.56 (either natively or via conversion kit) in the wild, and I wanted to reach out to the Hide to see if anyone here has any hands-on experience with them. I've had my 7.62-chambered MDR for awhile now, and am pretty happy with it; and I...

Before I spend the money on the tooling, is there anyone out there converting "regular" bolt knobs to work on the ARC actions? If I can spend a few bucks per knob to have someone else do it, it's worth the avoided headaches of purchasing the drill bit(s)/reamer(s)/tap/10-32 screws and doing it...

Upon reading in a recent thread that JARD has made an MDR sear assembly and that the folks at DT had played with it and feel that it's a nice piece, I decided to try one out. IMO, THIS is the trigger that I was expecting (well, hoping for) when reading the initial literature on the MDR a few...