A: There is no difference in decibel level which has nothing to do with felt recoil.

A: Yes it will with them all.

A: We have not tested it, but from the looks of the design it looks like it would work. If you wanted to test the BCG with their lower to see if it's a go we would be happy to hear any feedback regarding compatibility. If it didn't work then we would just ask that you send it back and we would refund your money and waive the restocking fee.

A: The difference is this 5.56 Bolt Carrier Group is drop-in ready. The M16 Bolt Carrier would need Bolt Assembly, Firing Pin, Firing Pin Retaining Pin and Cam Pin. Hope this helps.

A: Yes it will function fine with 5.56 or 300BLK calibers

A: The DI Bolt Carriers come with a standard integrated buffer which helps not only to eliminate metal on metal contact during the transition from upper to lower receivers, but it also buffers the impact between carrier and buffer. However, if one wanted to keep DI Bolt Carrier centered which mitigates tilt one would need to ask for a oversized buffer to install. Oversized buffers have a larger oversize dimension than the standard size polymer buffer.

A: We are the manufacturer of our bolt carriers. Our found/owner, Charles Cassels, holds the patent on these bolt carriers with buffer.

A: Our BCG will fit any mil-spec AR-15. As for the spare buffer, it has a lifetime replacement warranty if it were to malfunction/mfg defect, etc; however, customers kept requesting they could buy a spare so if something did happen they would have a spare replacement for backup while we replaced this part under warranty. While we have explained to customers we have never had to replace one they still requested a spare for their spare parts tactical box as a "just in case". Having never replaced one carrier buffer in 10 yrs of selling them indicates a pretty good functionality or usability testing. We have some spare buffers with over 20,000 rounds and they still look new, when designing this polymer buffer we used the best materials for this application and it went through rigorous testing.

A: Our Enhanced Bolt Carriers and Bolt Carrier Groups we sell through our site are for the Direct Impingement gas systems, we do no sell piston carriers as a standalone product. All of our bolt carriers work with mil-spec bolt carrier small parts. If you are looking for just the Bolt Carrier to add your small bolt carrier parts to you should be looking at this product: https://www.blackriflearms.com/M16-Enhanced-Bolt-Carrier-and-Key-with-Buffer-Technology-_p_20.html

A: Any firearm lube will work, the only warning FailZero/UCT gives for their EXO NiB coating is NO ammonia-based products as it can affect the finish.

A: In order to utilize JP Capture Spring with our BCG one would need to mill out the center of the polymer end piece to allow the JP Capture Spring Rod to clear the polymer to enter the bolt carrier.

A: NO, these bolt carriers are for direct impingement AR-15 rifles.

If you have a piston system you will need to contact your piston mfg for a replacement bolt carrier as each piston mfg designs their piston to interface with their bolt carrier differently, therefore, gas piston bolt carriers are not interchangeable.

A: The difference is the enhanced BCG not only comes with a Melonite QPQ bolt assembly but a Melonite QPQ cam pin. The non-enhanced comes with a phosphate cam pin. We are in the process of phasing out the phosphate cam pins and once they are gone we will only be offering products the Melonite QPQ cam pins.