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Posted 03 January 2018 - 04:59 PM
I took a break from the Gat project since July and returned to it about a week or so ago. The cocking mechanism is completed and installed. I assembled one bolt (all bolt parts are made) and tested it. It cocked and fired a blank. I am now assembling the remaining bolts and shaping the firing pins, two more to do. I tested all the assembled bolts and they function as intended.
Today I fired a 3 round burst (blanks), its so quick it sounded almost like a single shot. I can't fire normally yet, I have not made a top cover or mag at this point, but soon ! I am going to give a whirl at 3d printing a top cover and mag for test purposes, that should be interesting. I got the 3d printer last year, assembled it and tested it quick but have not done anything with it yet.
I have a few things to tidy up, gotta make the bolt insertion knob and knob for the cocking switch. Right now I just have a setscrew shaft collar on the cocking switch, no spring but it works just fine that way.
More to come........... ( PS I got a whole coffee can of blanks at a local flea market for $5.00 this summer, perfect for tests)
Posted 24 January 2018 - 03:53 AM
Been fine tuning. I had a few rounds fail to extract so I did a slight redesign on the extractors and made 16 new ones today, much better. Also, I wasn't thrilled with the cam timing and stroke so I made new ones that have less stroke and start the cartridge into the chamber sooner, feeds much better. I did 3d print a prototype cover and have it feeding from the stick mag. I also increased the firing pin spring tension, the indentation was marginal in the rims with a few fire failures, now they are much better.
While waiting for the cnc mill to cut the new extractors I got surfing and thinking about building the next gat gun. I took the plunge and ordered the barrels today, 6 of them, .410 shotgun. They are intended for a old mossberg bolt action gun so they are threaded and have no stock attachment blocks or anything attached to the barrel. Being a bolt action it used a extractor nearly identical to the RGG gun on the bolt. I won't start that project for a while though..... gotta finish up this one first and take a break. The .410 was picked because ammo isn't crazy expensive and there is the choice of slugs, buckshot, or birdshot, I reload handgun ammo now so setting up to reload the .410 wouldn't be a big deal if desired.
Posted 19 February 2018 - 12:42 AM
Update: Now have about 300 rounds of live ammo thru the gun and it is functioning flawlessly. 35 rounds takes about 3 seconds and is a real riot. I had a scrap of 6x6 post left over from building my pole barn that I used as a bullet stop, well it split in half from the trauma, there is about a inch dia ball of lead in the middle where a bunch of bullets went in the same hole. I made up the final top cover in brass, along with its latch. Remaining now is some cosmetic parts, the oscillator assy, elevation wheel, sights, knobs for the rear cover and a few other small items. Functionally its 100% as is. I will make a video when I get the cosmetics done.
Meanwhile, I am gathering materials for the .410 build. Got a piece of 4"ID brass with 3/16 wall, 15 inches long which should work great for a housing. Have the 6 mossberg barrels in hand.
Posted 27 February 2018 - 01:07 AM
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