98Z5V

Solved.

Measured the Matrix and one of the Aero uppers, in that bolt catch area, just to give you a reference. Bolt catch thickness area, from the inner machining - Aero was 0.075" and the Matrix was 0.060" thick, in those areas. You can cut. Lemme know if the dimensions I'm talking about don't make sense - I'm talking about how "thin" you could shave that area forward, and not have to worry,based in different manufacturers wall thickness there. IMHO, it's not a high stress area, and you could go thinner, maybe 0.050". Matrix at 0.060" first, then Aero at 0.075" second.

I ran it through Goggle-Fu to see what I'd get. Tons of pics, many combinations. https://www.google.com/search?q=308+ar+16"+barrel+15"+rail&source=lnms&tbm=isch&sa=X&ved=0ahUKEwigvMb0tfbUAhXr7YMKHZyYDV8Q_AUIBigB&biw=1138&bih=549

Just saw it - surprised they posted it. Other people need to know...

I'll text him right now. Last time I did, it was a couple days before he got back to me. I miss him, too - I can't keep up with the news like that fucker can. EDIT - msg out.

Nope. That ain't it.Screw my last ass-essment. Magwell length in the upper is 3.550" on a 308AR upper. For a .308 Win caliber upper, or any derivative. Note closely how far back my 308 BCG is, back of the BCG body, firing pin location, etc. Yours is the same, from your pics above. Your bolt catch cutout is on the wrong place, and that's not a long-action upper. The pic below is my Matrix upper. I think this posting-attemp will attach your pic first, then mine...

That's a THICK back on that bolt catch, for what it's worth. That thing can take some shaving. The more I look at it, the more I think that's a long action upper. YOUR bolt catch recess on the upper is further back than normal - but so are the recesses in the upper for a magazine. For a longer magazine?... That needs compared to a known 308ar upper, dimension-wise. I'll measure as many as you need for reference info - I have DPMS, Aero Precision, and Matrix Aerospace to go from. How far back that magwell recess/cut in the upper extends readward, from the front pivot pin area...

So is grocery shopping with your wife... over rebuilding an engine. I don't get it...

This is a great point - time to start calling Falkor and trying to find background info. The additional distance would be something close to this: I poked around on Falkor's website, and can't find long action AR receivers. Searching for SI DEfense long action AR receivers doesn't turn up anything, either. Falkor does make a long action magazine for 300 Win Mag, though. https://www.falkordefense.com/shop/parts-accessories/falkor-petra-10-round-magazine-300-win-mag/

I think all the DPMS LR308 lowers were set up for the screw, and not roll pin. I don't know the size of it offhand, but most of those screws (from DOMS, and other manufacturers) sucked, and broke if you even overtightened them a tiny bit. Ironically, SI Defense made one from stainless, offered it separately, and people bought them up to replace their broken "other" screws. The thing is basically a long allen set screw, that's been turned turn on the last 2/3rds of it. Here's the DPMS one: http://www.brownells.com/rifle-parts/bolt-parts/bolt-hardware/bolt-pins/dpms-bolt-catch-screw-prod54582.aspx Here's one manufactured by Black Rain Ordinance, which I'd trust more than a DPMS one: http://www.primaryarms.com/black-rain-ordnance-308-bolt-catch-screw-lr-12-308 This is what these things look like: Find an allen wrench that fits it, and take it out. It'll be easy to find out what the thread pattern is.

Fuckers...

No. That's not what I'm telling you. You never would have gotten a 308 barrel into a 5.56 upper. What I'm telling you is that upper wasn't machined in the "normal way" that SI Defense used to machine the 308 uppers. There's something up with it. The machining is all out of whack, and it's just not normal - it's not right. They square-cut the 5.56 uppers in that area, they round-cut the 308 uppers in that area. You have a 308 upper that has a 5.56 cut in it, IN THAT AREA. That doesn't mean the whole upper is a 5.56 upper - which is why I asked you for pics of everything. Bigass pics. You ended up with a blem that probably shouldn't have left the machine shop. It is what it is. SO. SO... Cut it. If the pins line up for the lower-to-upper mating, and the pins fit, then you have nothing to lose. Cut the damn pocket for the bolt catch, and see if it functions. If it doesn't - you're already out an non-functional upper receiver. You don't have anything to lose here.

Remember the BII they issued to every HMMWV? The "Pioneer Tools"? The Army eventually got smart, and replaced that high-priced shiit with the Max Axe. I had my own Max Axe long before the Army ever got that smart, though - essential part of the Jeep.

I get the comments... "Dude, we need an axe to get this shiit done..." Hold on, I'll get the axe outta my truck... "What the fuk,man! Who keeps an axe i their truck?!" Yeah, I do.

Yeah, fuk that.When you need an axe, nothing else is doing it. I keep this axe in my truck, and it makes DNP laugh. But the fucker has been used everytime we're out... It's a Max Axe, so there's anything that you can do with it. Shiit's not new, either - it gets beat.

First thing I noticed when clicking the link was the .260 Rem barrel. I'm interested. Integrated gas blocks definitely have me interested.

DAMN!!! The WHOLE FINGER just disappeared!!! FUK!!!

By the way, the vid came out great - but cutting the top off the bolt catch and welding something else to it isn't gonna solve that issue with the blem upper - that bolt catch recess in the upper is machined in the wrong place - it needs extended - for real. Everything else looks good, based on the vid, man. That's a pretty fat bolt catch, too - but that's not the issue here.

That's a left-over blem upper that someone had sitting in a back shelf somewhere. Cut it. It's not gonna hurt, because it's not worth anything else. Extend that cutout in the upper, and it should work fine. If you can, get a wider pic that shows the upper and lower, with pin alignment - not necessarily pinned together, but apart - something to see the distance between front and rear pins, both upper and lower in the same pic. It's definitely SI Defense, based on the cuts on the front of the shell deflector, but that square cut for the mag catch is something they did on the 5.56 guns, with the .308 guns having a round cut for it. Somethings up. Might as well chop it. Seriously. It's not gonna hurt.

Dremel and this bit will solve it - before I even see the issue - other ideas will come along shortly.

In my opinion, machine the upper area that the bolt catch is hitting. Cut it down. There's plenty of meat there.

Pete, pics will help greatly in this issue. Post pics of the fitment issue. I understand what you're saying, but you're going to get more solutions from others when the pics of the problem are posted. Feel free to post up in the Intro Section, as well.

There's nothing "cheap" on a rifle that's chambered for $6 bills... I'm working the 86 cases that we shot up last fall - really, we only shot 86 rounds through that thing, but it was all Hornady Match factory loaded ammo. That's $516 that went kinda quick... I feel bad, because Ron fronted all that, and didn't ask for shiit in return - I think he had a chubby at all the smiles... If you send brass, brother, then I'll load it all up and get some shiit going. Here's where we are right now:

So, IMI = win. Midway = FAIL. Step up, Larry Potterfield.

Today is a great day to watch Sons of Liberty. http://www.history.com/shows/sons-of-liberty