Show Off You Ars

[dave2176]

My son-in-law has been working in my shop for the last few Saturdays. This is what he finished today. 80% lower, GM barrel chambered in 5.56 with 10 flutes (5 up front, 5 under the hand guard), home made brake and gas block, black Cerakote. He also made a set of takedown and pivot pins since his LPK came with a .275 takedown pin for an AR10. IJK optics and laser.

 

[Blackhawk]

My son-in-law has been working in my shop for the last few Saturdays. This is what he finished today. 80% lower, GM barrel chambered in 5.56 with 10 flutes (5 up front, 5 under the hand guard), home made brake and gas block, black Cerakote. He also made a set of takedown and pivot pins since his LPK came with a .275 takedown pin for an AR10. IJK optics and laser.
View attachment 124606

What size endmil and what company did you get it from, I want to try fluting

Lanham

 

[dave2176]

What size endmil and what company did you get it from, I want to try fluting

Lanham

It was a 3/16" ball nose 4 flute, Interstate brand from Enco. DOC was .035" in a single pass at 1970 rpm. Setup used a 5C spin indexer and a v-block to clamp the other end down during cuts. Power feed was used. Took about 3 minutes per flute, the slow speed kept them smooth.
Dave

 

[Rick Leslie]

Homemade brake and gas block? Bravo! I would like to see details. Always interested in brake designs. Thanks for sharing. Looks like a great AR.

 

[coolidge]

My Colt

 

[dave2176]

Homemade brake and gas block? Bravo! I would like to see details. Always interested in brake designs. Thanks for sharing. Looks like a great AR.

The brake has 3 side ports on each side cut at 15* (head tilted), .260" deep with the 3/16" BN end mill plus 5 round ports to align with the flutes. .800 diameter enlarged on the inside after the threads to .550" (we think). Here's a couple pics before cerakote.


I don't have detailed pics of the gas blocks but it starts as 1.25Wx1.25Lx1.75H. Bore it .750 in the jaw .625" from the bottom. In the mill vise drill the gas tube hole .5 from the top 1.1"deep and ream with a #15 reamer. While the mill is in the same Y location lay it on its side and drill and ream the 1/16" pin hole .700 from the rear. Turn it bottom side up and drill 5/32" hole .300" from the front and rear for set screws and drill the rear hole to meet the gas tube hole. Drill a third set screw hole in the center (.625" from either end. Tap them 10x24. We mounted it on a mandrel to the rotary table and used a 3/8 ball nose to cut its profile rotating 2 degrees each pass.

 

[Rick Leslie]

Thanks for the details. The brake looks real good.

 

[Lucky 13]

This is my latest build. Tactical Machining 80% lower and TM upper, Noveske nitrided BCG and charge handle, Magpul CTR stock, MOE grip, Ballistic Advantage Hanson profile .223 Wylde mid length gas system, Noveske 13.5" NSR free float hand guard and topped with a Vortex Strike Fire 2. My 6 year old is starting his own after going through a couple mags with mine.

 

[ScrapMetal]

This is my latest build. Tactical Machining 80% lower and TM upper, Noveske nitrided BCG and charge handle, Magpul CTR stock, MOE grip, Ballistic Advantage Hanson profile .223 Wylde mid length gas system, Guntec 12" free float hand guard and topped with a Vortex Strike Fire 2. My 6 year old is starting his own after going through a couple mags with mine.

With the TM upper did you start with it in the raw or get in from them finished? If raw did you hone out the inside, sand it, or what steps did you take to finish it out? I've done a number of lowers but no uppers from "in the raw" but I have a couple on my bench waiting for a little attention.

Thanks,

-Ron

P.S. Open toed sandals in the shop? Shame on you.

 

[cathead]

What? Somehow the meaning is completely different without the apostrophe!