Almost done

I have one small chamfer up by the charging handle to do, and one small hole to drill and tap in the threaded portion of the buffer opening. Then, just the bluing and engraving.

I finished threading the buffer area. Had issues mid threading with the drive belt on the motor. Always adds a bit of fun to the game. Picked back up on the thread and finished it. Next one, I am going to thread mill the buffer end.

I used the extra long end mill to finish pocket. I got the mag well where a magazine would slip in, but the 9mm mag adapter would not slip in. had to file it until it would slip in. Made sure 9mm mag slips in and out with ease as well. This one will stay a dedicated 9mm lower. I want to map the opening and make another lower with the 9mm mag opening in it, without having to use adapter. I have extra blank forgings. They are only $20 a pop at the machine gun shoot. I picked up some upper blanks as well, thought they look a bit more tricky on the machining. I am going to try and do at least one upper. Would like to do a whole upper, lower and trigger assembly from metal stock just to have a gun I made from scratch.

Here is the mag fitting nicely in the lower. At this point, the magazine slid in and out nice, but, the 9mm adapter was too tight. I filed the opening until the adapter fit in snug, but not too tight. It will come out only to blue the lower, then it will go in to stay.

Right hand side done. The blank forging like the one it started as is above it for comparison.

Left side done. Again, the blank above for comparison.

And a shot of the top. A lot of work, but it was fun and productive. I will finish the couple minor items tomorrow and dry assemble the whole trigger assembly, buffer tube, upper and magazine to make sure all fits are good. I tried the magazine release hardware earlier and know that works well as does the handle assembly. Upon checking out the pictures as I am doing this write up, I noticed I forgot to mill the bottom trigger guard groove, which is no big deal. I left it flat so I could hold on the flat bottom in the vice. I no longer need to mill off of surface, so I can finish it now. If I get it done tomorrow, I will post pics of the finished product. May take it to the club later in the week to try out before bluing and engraving. Like to make sure it works. Anxious to try out the 9mm upper and see how it works. Have a lot of 9mm ammo.

That was quick

My extra long end mill showed up four days early. Definitely going to order more through them. Got home and finished boring the hole for the threads. Found a better boring bar than the one I was using, but not my good one. It cut straight, no push off. I am going to tear the office area apart tomorrow night. I have looked all over the garage for it. Why it is not next to the lathe I don't know. Has a nice threading insert in it. I can use the one I am using if need be, but the carbide insert is new in the one I am looking for, and probably a bit more accurate than the hand sharpened high speed one I made. Should finish up Saturday morning if I remain off the work list. There is a steam show this weekend in Elnora I usually go to. I am leaning toward just working in the garage on some projects. See what I feel like doing.

Made my fixture for threading the buffer end of AR lower

Much like me, it ain't pretty, but it does work. I took a piece of 1.5 inch round stock and milled .125 off a section of it. This gave me a flat area to screw the lower to, and, it also centers the buffer hole (which is .625 above flat) when bolted together. Still have to center it side to side, but, that is pretty simple.

 Next, I needed a way to clamp the lower to the fixture. I fashioned a plug that will fit in the roughed out magazine well. For the next lower, I will use the same fixture, but, I will drill and counterbore through it and tap mating holes in the solid pocket area of the lower.

I drilled the holes to match those in the fixture. I bolted everything together, then, removing one bolt at a time, I used an end mill to make a flat so the bolt would tighten down straight, instead of angled, so it is nice and solid. Repeated for all three holes.

Ready for lathe. Like I said, she ain't pretty, but it is solid. Much more rigid than I thought it would be. I milled a couple flats on the side to put a brace on each side if needed. The flats are the same exact width of the outer surface of the lower. For now, I don't think I will need them, but if need be, they are there. I have some 1/8 flat stock I can easily make clamps with.

Here it is mounted in the lathe. It clears the bed easily. It is very rigid. I indicated the face true and centered the hole side to side, then, tightened everything down. One more check to make sure nothing moved.

I couldn't resist trying it out. Too late to finish the hole, but, I had to know if it was going to work. Once I got the hole trued up that I drilled in there (The drill kicked the piece to the side a bit and the hole was way off) when it was in the mill, it cut clean with no chatter. That is, until you hit the area where the threads are only on one side as it ramps down. It pushes off a bit here. It works out though. I am careful and slow the feed down (I kick the feed lever out and feed really slowly by hand) in this area as it lopes through the ramp. It forms an undercut on that side from the slight kick. Hard to describe, but I will take a picture of it when done. I hope I can figure out where I put my good boring bar. I have a threading insert in it, and it is the perfect size for this job. Thick enough to be rigid, but small enough to fit. Thought I had it in my Gerstner box. I have a few more places to look. I would like to finish the buffer area tomorrow. I am off again this weekend, if they don't change their mind. Hopefully my end mill arrives and I can finish the magazine pocket. Then I can blue it and assemble it. I still need to engrave it as well. Haven't figured what all to put on it yet. Been getting ideas online. Lots of recommendations of putting a serial number on it. One guy had a decent idea. He engraves his NRA member # followed by what number receiver he is on. That way, if law enforcement looks at the gun, you don't get grief for no serial #. Using a number you can remember helps if you need to report it stolen, so the NRA # is on your card, and unlike your social security #, you don't really care if someone sees it.

Back to work, bah humbug

I ordered the end mill to finish the magazine well. Hopefully be here by the weekend. Had an idea for a fixture for the lathe to hold the lower for boring and threading the buffer hole. Got it machined this evening. Need to pick up a few socket head cap screws tomorrow to try it out for rigidity. Wish I had thought of it before hollowing out the pockets, but, I made a couple of side plates for the fixture which should steady it up quite a bit. I will find out tomorrow. Be nice to finish it this weekend. Like to try it out and see how it works. I have a couple more blank forgings. I am going to try and make another one with no flaws. I have a block of clear poly carbonite that I want to make a see through model of for display. Think it would look cool and be able to see the inner workings. One step at a time. Hopefully get the weekend off again. Not holding my breath on it though.

It is a lot lighter now

Got the trigger area cleared out. She is a lot lighter now. Just have to thread mill the buffer tube threads in it, and finish mill the magazine well. Need to get a extra long end mill to finish the mag area. It does fit nicely though. I have a couple minor blemishes in it, but it is functional. Not bad for the first one.

 

I started off by finishing the mag release slot on the top of part.

It is easier to mill pocket if you drill holes to remove most of the material. These holes go about .010 shy of hitting bottom of trigger pocket. Want to be able to cleanly mill the bottom with no imperfections.

  The last three holes are smaller, and shallower. Same idea though. Want to remove material and it gives you a visual for where the end of the pocket is so you don't run past it when milling.

Here is the trigger portion of the pocket milled out. It is still rough in this photo. Forgot to shoot one when I had this portion finished, and before moving on to next portion of pocket.

Here, pockets are done. I didn't take a picture of the small trigger opening being milled out, but, there really isn't much to it. It is done, just no picture.

 It is a nice tight fit. No slop, very little daylight at all. Don't want to install trigger assembly until I have the buffer area threaded and the magazine well finish milled. Even then, I want to blue it before final assembly. May make a slightly undersized pin to temporarily hold magazine release lever so I can dry fit everything. That roll pin is a real SOB to get in and out. I made a small block for use as a guide to hold pin when hitting it in, if I can find it. It is just a hole in some keystock, so nothing fancy, but it works. Don't want to scratch up the finish when I finish assemble it.

I weakened

Have not bought a gun in a long time. Still didn't buy a full gun, just most of one. Picked up an upper in 9mm for an AR. Also picked up a magazine adapter and a couple of 9mm magazines, and a bolt carrier for it. I want to reverse engineer the adapter and make one from scratch, just because. May try and make a 9mm specific one piece lower, again, for the heck of it. I am back to machining my lower again. I swear if I get away from something, it takes forever to get back to it. I started milling the magazine well. I got as far as I can on the mag well until I get a 3/8 extra long end mill. I had one, but being the pig that I am, I can not find it. Tomorrow I will start on the trigger pocket so as to get something done on it. If I can get the trigger pocket done, I can see if work will loan me an extra long endmill for a day to get the other pocket done. Still need to threadmill the buffer tube threads.

 Here is the upper assembly. Have to find a set of sites for it. I have a set around here somewhere.

This is the magazine adapter along with one of the magazines I picked up for it.

 

 

I drilled some 1/8 inch through holes where the corner of the magazine pocket will be to make the finish radii in the corners. I drilled holes in the magazine to get rid of some of the material to make milling a bit easier. Here I am starting to mill the pocket out.

Here is the pocket roughed out. I need an extra long 3/8 end mill to finish the rest of the pocket. I left .005 per side stock to allow a finish pass. It was about dinner time, so, I went to the store and picked up a nice porterhouse for dinner. Kind of hard to get back at it after steak, potatoes and corn on the cob. Me and the dog relaxing a bit. Watch a bit of Roku, and hit it again tomorrow.  Hope to finish the trigger pocket tomorrow. I think I made the guys day at the show. Holiday weekend with great weather does not make for a heavy crowd at a gun show. None of the vendors were making out well.

Another three day weekend

I can get use to them really quick. Last week was Frog follies, which was awesome. This weekend, gun show, fair, and messing around in the garage. I hit the gun show this morning. New vendor showed up. He said he usually hits up the Crown Point show, but due to a booking error, wound up down here for the first time. He has a very nice selection of AR products at a reasonable price. May go back tomorrow. He had a special going on a 9mm AR at a decent price. Came home and checked around online and couldn't even come close to his price.
Weather is down right gorgeous. May hit the fair tomorrow for a bit. Good walk around weather for some outdoor activities. If I pick up the AR, I will head over to the club to break it in. May head out there anyway. Haven't been there in quite some time. Working way too much. My FMLA abuser made a brief appearance. Managed to work a whole four days. Amazing how as soon as a new month rolls up, he gets sick and takes his two FMLA days he is allotted per month, right off the bat. He should be good until October now, once he comes back again.