Description
***In Stock***
The Ultimate Hard-Use 5.56 Bolt Carrier Group:
These aren't designed to be pretty. They're not meant to compete with the gorgeous museum-quality $200+ units that other well-respected manufacturers are putting out. But this is not just another component; built to exceed military specifications, our bolt carrier group is designed to be the hard-use always-performing heart of your AR-15. It just happens to look pretty darn good.
***These are All-Chrome Except for Phosphate Gas Key and Extractor***
-Phosphate Extractor
-Phosphate Gas Key
-Sprinco 5-coil Extractor Spring and Sprinco Ejector Spring
-OCKS Fasteners, Properly Staked
Microbest is one of the finest manufacturers of mil-spec bolt carrier groups for the military and small arms manufacturers. These are individually High Pressure Tested and then undergo a Magnetic Particle Inspection. We recommend degreasing and lubricating before installation. Ships in OEM packaging.
Features:
All-Chrome M-16 BCG, Phosphate Gas Key and Extractor
Mil Spec Carrier
- 8620 Tool Steel
- Full Auto M-16 cut
Mil-Spec Bolt
- C158 Steel
- Shot Peened
- High Pressure Tested (HPT)
- Magnetic Particle Inspected (MPI)
- Chrome Silicon Ejector Spring by Sprinco
Mil Spec Extractor - PHOSPHATE
- 4140 Steel
- Chrome Silicon Extractor Spring by Sprinco
- Black Extractor Insert
Mil Spec Gas Key - PHOSPHATE
- 4130 Steel
- Optimized Carrier Key Screws (OCKS) provided by Michiguns
- Properly Staked
- Mil-Spec Opening Verified and Optimum Alignment Checked
Weight: 11.6oz
Customer Reviews
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Awesome product
Upon cleaning and lubing I found no flaws that will impact performance. Not saying there are flaws, I only looked where it matters and everything is great. The staking is fantastic, the 3 bore is very clean/smooth (can’t measure), gas rings are tight, the bolt support shoulder and tail are smooth and within spec. The extractor is tight, nice sharp edge, and indeed comes with a 5 coil Sprinco with the insert, no oring. The ejector is stiff and moves smoothly. It passed headspace for 223 and 5.56 in a Colt 5.56 chamber. It runs extremely well and cleans up like nothing ever happened. I’ve put a couple hundred rounds on it and there’s no wear showing. I’ll be buying more.
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Chrome BCG
Crazy value for this bcg. Shipping was super fast as well
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Hard Use BCG
I was torn between this and a Geissele Nanoweapon BCG. Both are great but this comes at a much lower price point with some nice features such as the Ocks Fasteners and Sprinco springs. I have run well over 3k rounds (FRT) and it wipes off clean as if it came out of the factory. Arguably the best value BCG for hard use set ups.
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Microbest premium
The quality is on point! You can trust arftac for a worthy product and super fast shipping!!!
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10/10
Solid BCG and spectacular customer service. If you're even slightly on the fence, then you should just buy this already. They sell out quick, and for good reason. Chrome is goated, as is Arftac.
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Great Buy
I was looking for a premium upgrade to my current BCG and decided to go with this hard chrome option after doing some research. When it arrived, the first thing I did was inspect the machining and surface finish. The quality was immediately apparent. I ran my finger over all exterior bearing surfaces that contact the inside of the upper receiver, and everything felt smooth and consistent — no rough spots, tool marks, indents, or blemishes. After lubricating it properly and installing it, I took it out to break it in. It cycled smoothly and performed flawlessly. No issues during initial testing. I didn’t gauge it this time, but based on fit and function out of the box, I’m very impressed. For my next purchase, I may verify tolerances with gauges just out of curiosity — but so far, this BCG has exceeded expectations.
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Appears flawless
Second chrome microbest I've gotten from arftac, first run has run beautifully with a 13.9 criterion core in a BCM, headspaced like it should. This one is going in a 6 max build with sons 18" barrel,
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One of the best chrome bcg's out there
Have ordered multiple of these bolt carrier groups, all have had good gas ring seals and have been free of blockages or defects. The nitrided gas key and extractor as well as the upgraded extractor spring is SOTAR-approved and will likely see many, many rounds before a hiccup.
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BCG
Spent a lot of time researching bolts. Came across microbest. Figured I would give it a try Bolt looks great. Functions great. Def worth buying. Will order more
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High Quality BCG
Looks, feels and fits great. Performs flawlessly.
