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Due to the reduced mass of this bolt carrier group, you will want to start with an H3 buffer and likely an enhanced power spring.
This BCG will work in any standard AR-15 receiver and the bolt is a standard 5.56 bolt, which will be appropriate for .300BLK. You will likely need to tune the buffer weight or gas system to accommodate the lighter carrier.
Yes, this BCG is compatible with 5.56 and .223 Remington.
The Faxon Firearms Gunner Light Weight 5.56/.300 Bolt Carrier Group can be used with the JP Enterprises Gen 2 Silent Capture Buffer Spring System.
This should not be an issue.
if you have a 223 wylde or 223/556 multi barrel, then yes, you can shoot 223 with this. bad things will happen if you try shooting 223 with a 300blk barrel (other way around too)
Specific tuning will depend heavily on the ammunition you are using and the peculiarities of your particular build. We recommend starting with a standard Carbine spring and H1 buffer (or extra power spring and Carbine buffer) and then tuning up. We also highly suggest an adjustable gas block as tuning the gas system will be much better for precise timing.
Yes, there is benefit to pairing them. The recoil reducer would lessen the muzzle rise and impact on the shooter. The reduced weight of the BCG has been shown to reduce the bolt bounce on return. This can aid in speed shooting.
https://www.opticsplanet.com/dpm-recoil-buffer-assembly-for-m-16-ar-15-223-5-56-calibre-rifles.html
The lightweight BCG weighs 8.5oz complete!
Yes, an adjustable gas block is recommended if you are not using a heavier buffer with the Light Weight BCG.