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Reviews & Ratings for Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete — 7 reviews

(7 reviews)
Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete
Cryptic 6.5mm Grendel II Bolt Carrier Group (BCG) - Complete
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Most Helpful Positive Review Incredibly slick
I got the black one because of its crazy friction coefficient. I didn't really believe the 0.01 in the description, given that's the coefficient for skates on ice. Once I got and felt the thing, I am a believer! Never mind NiB, this thing is so smooth, I wiped the carbon off the bolt after about 100 rounds without any solvent. Wiped carbon off a bolt with a dry patch. Let that sink in.
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smooth as silk

by jaytay, Verified Owner from TN, United States Written on September 28, 2025
This is my 3rd criptic carrier one for 6.5 grendel one for 22 arc and now this one for my 6 arc they are all very smooth and no problem out of any of them, i will be buying more for my other ar's.
Would recommend: Yes
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Cryptic 6.5mm G2(BCG) - Complete

by Hollow, Verified Owner from FL, United States Written on March 30, 2025
It's okay it's more for pictures. I shot with it and there was a failure to feed. Also a lot of shavings come off so look for that. Luckily I keep a spare BCG in my range bag. Switched it back and it ran smoothly.
Pros:
  • Price point
Cons:
  • Doesn't run well
Would recommend: No
Was it helpful to you? Yes | No
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Impressive

by Robert, Verified Owner from TX, United States Written on August 30, 2024
After seeing a dealer's cryptic BCG after 750K full auto rounds still looking new, I was sold. These are my BCG of choice now.
Pros:
  • None
Cons:
  • None for me
Would recommend: Yes
1 of 1 found the following review helpful.
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Cryptic BCG

by AJ, Verified Owner from MN, United States Written on March 2, 2024
Awesome BCG, barely needs lube! Cleaned it to dry, put very little tri-flow on it. So smooth!
Would recommend: Yes
1 of 1 found the following review helpful.
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Cryptic 6.5mm G2(BCG) - Complete

by Hollow, Verified Owner from FL, United States Written on January 14, 2024
It does everything thing it says in the description. Solid and very well made.
Pros:
  • It exceeded my expectations & I love the color.
Cons:
  • No cons in my opinion.
Best Used for:
  • AR-15 Builds/unique upgrades
Would recommend: Yes
1 of 1 found the following review helpful.
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Perfection

by Rallen, from TX, United States Written on January 1, 2024
These BCG’s are definitely worth the cost. With Nickel Boron being their lowest grade of coating, you can imagine how slick the mystic are. Two drops of your favorite lube and have fun. Clean up is comical with a quick puff of air and a wipe. After seeing one of these with 750k rounds on it and looking new, I was a believer.
Pros:
  • Quality
Cons:
  • None
Would recommend: Yes
1 of 1 found the following review helpful.
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Last updated 2025-11-12 UTC.