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UM Military Machine & Tool Nickel Boron Bolt Carrier Group 5.56 .223 300 Blackout

UM Military Machine & Tool Nickel Boron Bolt Carrier Group 5.56 .223 300 Blackout

review
5
0
5
On sale $97.95
Retail Price:$199.99
Your Savings:$102.04(51%)
Temporarily Out of Stock
Part Number:5296

UM Military Machine & Tool



 

UM Military Machine & Tool has been in business since 1968 making bolt carriers for the US Military and only has in the past month started selling to the general public. UM Military Machine & Tool products are 100% made in America.
UM Military Machine & Tool line operates one of the only line assembled/staged bolt carrier facilities in America. The Nickel Boron coating provides increased lubricity and much greater wear resistance than standard finishes. The UM Military Machine & Tool Line also features a special staking process that triple-stakes the carrier key, 
thereby not harming the finish of the carrier.

UM Military Machine & Tool Nickel Boron BCG is exact heat-treated, shot peened, relief cut, and machined to exacting Mil-Spec standards.

UM stands for UNITED MACHINE, built in one of the oldest plants for M16 bolt carrier Manufacturing in the USA.

Bolt Features:

Certified Carpenter 158 Steel

Heat treated per Mil-Spec Requirements

Shot Peened per Mil-Spec Requirements

MPI Tested Material

HPT Tested 

Nickel Boron Coated

 

Bolt Carrier Features:

Certified Carpenter 158  Steel

HPT Tested

Nickel Boron Coated

Nickel Boron Coated Bore

Bolt Carrier Key is triple-staked for the ultimate in staking

UM Military Machine & Tool makes carriers for the US military and militaries around the world.

M-16 style with more mass for better functioning in semi or full auto rifles.

5 Stars
Excellent Bolt
Bought 2 of these bolts! Initial inspection was excellent and they just feel slippery! I disassembled them both and the only thing I noticed is on one the cam pin was a little out of alignment rubbing on the gas key to remove it! Function is perfect; it only takes a little lift with thumb nail to pry it out. There is a real noticeable difference in smoother functioning of the Nickle Boron bolt over the mil spec bolt! Very nice bolt for the price! Would buy it again, 5 Stars +
Did you find this helpful?  2 of 2 Found Helpful
Reviewed by: (Verified Buyer)  from AZ. on 3/25/2017
5
5 Stars
flawless
love it, no problems with it. had for 3 months and over 1k rounds. looks great and works.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by: (Verified Buyer)  from washington. on 5/16/2017
5
5 Stars
Slick
I bought this for a build, the first time I slid it in it so smooth that I had to try it on another. It was just as smooth, I had had to buy another.
Did you find this helpful?  1 of 1 Found Helpful
Reviewed by: (Verified Buyer)  from Houston. on 3/24/2017
5
5 Stars
Bolt carrier group
High quality item,I have purchased 5,they work flawlessly.
Did you find this helpful? 
Reviewed by: (Verified Buyer)  from Texas. on 4/14/2017
5
5 Stars
Great Bolt
Best quality, and Nickel Boron.
Did you find this helpful? 
Reviewed by: (Verified Buyer)  from St Louis. on 3/19/2017
5

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