MachIVshooter
Member
So, I got bored this afternoon, having finished the Chevy truck I had to deal with this morning, my kid down for a nap, and stuck waiting on cutters and materials for all my paying machine jobs. So I decided to do something with the little leftover 5-3/8" chunk of .22 barrel liner from my pack rifle build. I just happened to have a .225 reamer, so I chambered it real quick, then sat down and sketched up a design, as I don't much care to build existing ones, find it boring.
After about a half hour, we had this:
Initially I thought about using two 1/4" pieces of 7075-T651 plate to make halves, but ultimately decided I was better off using a piece of 3/8" 7075 and a 1/8" side plate. Problem is, I don't have any 1/8, and I didn't really feel like sacrificing a piece of 1/4" 7075. But I did have some scrap 3/16" 5052, which is easy enough to turn into 1/8" with a 10" staggered tooth face mill:
Next was hogging the 3/8" piece for the internals. No measurements taken, just photocopied my sketch, cut it out, and traced:
About the time I was finishing that, my kid woke up, so I had to stop here and take care of him until bed time:
But I did get a couple more hours in afterward, which leaves us with a shaped frame, cut for internals, and a roughed out 4140 barrel block, which the barrel will be TIG welded to:
Side plate is attached with three 4-40 stainless flat head socket screws. All the pins for fire control, barrel pivot, catch, etc. will be blind, seated .100" deep in the frame and side plate. The only visible fastener affer grip panels will be the front screw. I haven't decided on grip panels yet, probably carbon fiber like my O/U pistol, or maybe black ABS. But I could change my mind, might incorporate wood for a change
Anyway, got a crazy day with automotive work tomorrow, and a very busy weekend, so not likely to be further progress until next week, but will update as soon as there is one!
After about a half hour, we had this:
Initially I thought about using two 1/4" pieces of 7075-T651 plate to make halves, but ultimately decided I was better off using a piece of 3/8" 7075 and a 1/8" side plate. Problem is, I don't have any 1/8, and I didn't really feel like sacrificing a piece of 1/4" 7075. But I did have some scrap 3/16" 5052, which is easy enough to turn into 1/8" with a 10" staggered tooth face mill:
Next was hogging the 3/8" piece for the internals. No measurements taken, just photocopied my sketch, cut it out, and traced:
About the time I was finishing that, my kid woke up, so I had to stop here and take care of him until bed time:
But I did get a couple more hours in afterward, which leaves us with a shaped frame, cut for internals, and a roughed out 4140 barrel block, which the barrel will be TIG welded to:
Side plate is attached with three 4-40 stainless flat head socket screws. All the pins for fire control, barrel pivot, catch, etc. will be blind, seated .100" deep in the frame and side plate. The only visible fastener affer grip panels will be the front screw. I haven't decided on grip panels yet, probably carbon fiber like my O/U pistol, or maybe black ABS. But I could change my mind, might incorporate wood for a change
Anyway, got a crazy day with automotive work tomorrow, and a very busy weekend, so not likely to be further progress until next week, but will update as soon as there is one!
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