A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.
Dunno yet. I have the JP's but have not yet had the time to really look them over. I'll wait until the other ones come and then find some time to test / record / report. My rough plan is to check how / what tq it maintains throughout what amount of thread advancement, and how they maintain parallelism as tq is applied, what tq it takes to completely collapse the thing to the point where tq starts increasing to bore-collapsing tq levels-- more or less a destructive test.
I'm kinda expecting both to be exactly the same product, maybe sourced from the same place or one from the other. I mean the crush washers we've been using all these years are, I believe, an off-the-shelf item that has been out there for other industrial applications for years, not a product that was developed especially for the MD application. Seems like I've seen them in industrial catalogs but I never really stopped to investigate.
The JP Double Crush washers and the Armageddon Tactical crush washers are two completely different designs. Just an FYI before you receive the ones from Armageddon Tactical.
One thing that's supposedly great about the JP double crush washers is that they allow about 1 and a 1/2 turns from initial contact with the muzzle device, while standard crush washers only allow about 1 and a 1/4 turns from contact and the Armageddon Tactical crush washers are actually even less, at only about 1 turn from contact... This is only gleaned from reading the product descriptions though.
The JP double crush washers also stay centered on barrels that have relief cut threads because they are thick enough to where they don't slip into the relief cut like standard crush washers, split washers and shims do. They also stay centered better than the Armageddon Tactical crush washers because they have a slightly tighter inside diameter.
Last edited by 556Cliff; 11-14-20 at 10:42.
Crush Washers suck.
These: https://precisionarmament.com/produc...washer-system/
Allow for perfect torque, every time, and keep MDs and Suppressor Mounts perfectly timed and straight.
I was at an armorer course, building a centy 12.5" + PA washers + FCD 6315KM.
For whatever reason I, nor the instructor, could get the MD and the barrel to time correctly. The instructor took over and got it; although, I worry to this day that there was too much torque applied. It was the only time the PA shim system didn't work out perfectly for me (we also tried PWS shims).
edit: grammar.
Last edited by Hulkstr8; 11-19-20 at 15:13.
I’ve experienced this.
Have resorted to stoning a thicker PA washer to an “in between” dimension for a proper fit without having to over torque.
A true "Gun Guy" (or gal) should have familiarity and a modicum of proficiency with most all firearms platforms.
RLTW
Former Action Guy
Disclosure: I am affiliated PRN with a tactical training center, but I speak only for myself. I have no idea what we sell, other than CLP and training. I receive no income from sale of hard goods.
I politely disagree about the "angle" at which the MD theoretically contacts the barrel shoulder.
Let's theoretically remove the washer or crush washer for the time being.
Yes the male threads on the end of the barrel are angled in relation to the "straight" linear tube of the barrel. BUT the female threads of the MD are angled in an equal pitch; opposing direction. The ideal intention is for the opposing directions of male/female threads to be so precisely opposite of one another that they bind in a perfectly straight line with the linear tube that they are working on together. ...the bore
If the female threads on the MD were concentric to it's own bore then as it was twisted onto the barrel it would spiral down the angled male threads on the barrel and indeed contact the shoulder at the "off angle" of the male threads pitch on the linear barrel. But since the female threads are not concentric it twists down relatively straight in line.
I have no mathematical engineering proof of this, it is just my own semi-promechanical understanding of threads and their pitch.
Now I do not doubt for a second that MD's and barrel shoulders improperly align all the time. And a crush washer would be more forgiving in those instances. And I also believe that over torqued MD's can possibly ruin the straightness of a otherwise perfect muzzle by pulling on the tip or starting to pinch down on the opening
because it is too tight. But not so much by landing on the muzzle at an angle and torquing unevenly.
To add to the thread. I have removed some factory installed MD's on precision bolt guns that took over 60 ft lbs to start backing off. I have under torqued MD's lots of times. (they start to back off after firing)
I have never over torqued a MD in my minimal experience. At least nothing that made me say my accuracy went to sh!t because I over tightened that MD. My biggest fear when really torquing a MD is stripping the threads or literally twisting off the muzzle. Even though 30 or so ft lbs should never do either of those on a well made barrel, it's my own gut feeling.
“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
- Mark Twain
Bookmarks