View Full Version : metal
01-27-2009, 08:00 PM
there was an article in shotgun news awhile back on the different types of metal used in the making of a weapon, ie.. one type for barrels, another for recievers, and another for the trigger parts and so on. does any one rememeber what was what from that article? I'm in a CAD drafting program at my local community college and my project for this semester is to to do a weapon of some type. I havent decided on whether to do an AK pistol or a WW2 SUB machine gun. It would be nice to be able to qoute the correct spec of metal for each part. 4140 etc.. The more detail I give, the better I draw both by hand and computer the better my grade. And yes I have to hand drawn engineering sketches also before i even start on the CAD drawing itself. Any help given would be greatly appreciated. Thanks for your time in advance.
First you ARE going to make a SEMI version right??
I have that article somewhere but basically use 4130 or 4140 for a tube gun and 1018 or similar for hardware,sights sling mounts etc.
01-28-2009, 10:48 PM
Oh yeah. I aint THAT foolish. I like my toys n all, but something like that is not worth the risk of jail time. Some one once sold me a parts beast AR15. I asked several times " it wont go full auto, right?" each time I was assured it wouldnt. Rifle had some bugs, so it took a while to get it to fire. When I did, it did a runaway on me. I had to borrow the units copy of the depot level maintence manual to figure out what was wrong. Dill weed had slid a full auto selector switch in on me. Pissed wont begin to describe how I felt. I popped that puppy out and destroyed it. Did with out till I could get to a gun show and purchase the correct one. Still pisses me off that guy did that. He was an E-6 in the coast guard, a gunners mate, so he knew what he was doing and lied to me on top of it.
SO, long n short is this is primarly an exercise on paper/computer for a portfolio for resume purposes. I wont actually look to build anything till this summer over the break.
01-29-2009, 12:00 AM
Uh, a full auto selector switch will simply give you two semi auto fire positions and a safe when used with an AR15 trigger and disconnector. In order for the selector to affect anything other than the safety on-off you would need an M16 trigger and disconnector. Both of those are a no-no in an AR15. In addition, the AR15 bolt carrier and hammer are designed so that the hammer will jam the bolt carrier in an open position if the hammer follows, which is what would happen with an M16 trigger, disconnector, and selector set to full auto in a rifle lacking the auto sear. Another two potential M16 parts installed. Also no-nos in an AR15. If you still have this rifle I'd be checking it again.
01-29-2009, 12:41 AM
actually i had a full auto selector switch, an semi auto (AR15) hammer, bolt group unknown. with the full auto selector switch flipped to full auto, depending on WHEN you released the trigger it would do one of a couple things; stop w/ bolt closed, hammer in the fired position, needed to recock it manually or stop w/ bolt closed, hammer cocked. but it shot like a runaway gun tho. once in a while I could catch it with the bolt locked open. go figure. When I got done with it, it would ONLY fire semi only. And I used the Coast Guard boarding team check sheet for checking weapons to verify it would only operate / pass as a semi only weapon. as far as the bolt groups go, I've had several different manufactures of AR's. Each bolt group was different as far as the length of the milled area / slot went in the bottom of the bolt. Olympic, rock river, colt each was a little different, each was supposed to be a semi auto bolt only. as for the hammer and other stuff, it all passed tech check as AR semi auto parts only. this was a pre REAGAN AWB rifle. I had bought it back like 1987? Hammer is an AR hammer I swapped out the trigger group for a 2 stage timmney unit. put a metal adj stock on it also. there was no such thing back then as pre ban, post ban, or machine gun parts ban in a semi only weapon that I remember. but I could be wrong date wise about the machine gun parts thing tho.