Recent content by Joe Mamma

You may want to consider something like a "muzzle projector sleeve" from Damage Industries http://damageindustries.co/index.php?route=product/product&path=120_123&product_id=95 which screws onto a muzzle brake like this...

Yes, so you know every 870 receiver production and finishing run. Sure I believe that . . . There are rougher receiver internals (like significantly sharper edges) on Express guns. Almost anyone can see this when they look closely. Joe Mamma

For one thing, the receivers of some 870s (not the Express receivers) are vibra-honed to smooth out sharp edges and rough spots before finishing. If you compare the internals of the receivers and look very closely, you can see this. Joe Mamma

There are a LOT of people who cleaned their 870's (including the chambers) before shooting them and still had these same problems. There are a LOT of people who polished (or honed) the chambers on their 870's and still had these same problems. I don't think the problem is simply the...

It's a very common problem. Most people will say it's simply a rough chamber. But I'm not so sure that's the cause. Here's another thing to consider: https://www.youtube.com/watch?v=mlGoxNsaieE Joe Mamma

Yeah, I've heard of gas tubes melting in extended rapid fire situations like that. Joe Mamma

That's impressive. Great pic too. Nick Leghorn and "The Truth About Guns" just did a detailed review of a PWS piston AR. It did really well: http://www.thetruthaboutguns.com/2014/03/foghorn/gun-review-pws-mk-114-rifle/ Joe Mamma

MistWolf, the first part of what you quoted was in response to what ugaarguy wrote, not you. You bring up an interesting point about the heat. I actually don't know how much heat is dumped into the receiver area with DI guns. Maybe it's not nearly as much as most people think. Joe Mamma

It looks like Primary Weapons Systems just came out with a new video. It seems like a good overview of their piston system rifles. https://www.youtube.com/watch?v=amsRdwMtq8Y Edited to add, here is a link to the part in the video which shows a good cutaway of how their piston system...

Two things: 1) 2) Actually, 100% of the gases (which is used to cycle the gun/bolt) ARE directed into the upper receiver. Some of that gas makes it out the exhaust ports in the carrier. But technically, that gas still went into the upper receiver (which houses the bolt carrier and gas...

MistWolf, I am going to strongly but respectfully disagree with you. * First, let's agree that you won't bust on me for using the "DI" and "piston" terminology, and I won't bust on you for using the term "AR" when you are not talking about Armalite rifles . . . With the direct...

That would be guys like me. On behalf of all of us, thank you for going through all the effort to write it. Joe Mamma

I'm confused about how many books (2 or 3?) we are talking about in this thread. mec, if they picked up on "the second book" (as you put it), what is the first book (with the "glaring edit failures")? Is that the one you linked to in the first post or is it a different one? The book...

It's ironic that the posters picking on people for their use of the words "piston" and "DI", have been referring to these guns as "ARs." In this context, "AR" is a term referring to an AR-15, which is a gun made only by Armalite (or Colt because they licensed the name) . . . But back on...

Edited I think the best ones are made by Primary Weapons Systems (PWS). They are very high quality. You can buy the just the upper/barrel assembly and mount it on your existing AR lower (if you have one). There was a similar thread on a different forum recently. Some people don't know about...