Fathom Arms Enhanced Bolt Carrier Group
I have used a number of AR-15 bolt carrier groups over the years. You can tell which ones are engineered well and which ones are not by just dry fire charging the AR-15. Some have some drag to them. You can tell they they are low speed high drag. While others, like the JP Enterprises FMOS I have, feel like glass. This is particularly interesting when lubricating them with the same lube! This Fathom Arms Enhanced Bolt Carrier Group feels like what KY Jelly feels like between y