Factory Service Bulletin

Date: 1-5-06
TNW now offers a redesigned breach lock and bolt modification for all M3-fifty-cal guns. Some of the M3 kits on the market have come into the country with soft or damaged breach locks. While TNW has inspected all breach locks and bolt assemblies that have gone into our products, we have decided to implement a design change. If you have a semi-auto M3 gun and want this change made, please contact us.

Date: 6-13-05
It has come to our attention that some of the fifty caliber bolts and breach locks are showing wear and will become deformed over time. It is important that every time you shoot or clean your weapon that you check for this. Below are photos showing the lock up area. If you are not sure if your bolt or breach lock is worn then please send them both in to TNW for a free check. We also have available replacement bolts if yours is worn out. Another sign of wear is that you will notice that while setting your head spacing that the barrel is screwed in further than normal or you are splitting cases near the rim. Always set your head spacing before shooting the weapon.

NOTE: Shooting a firearm with a worn-out bolt or breach lock will cause catastrophic failure which will result in permanent damage to your top cover and side plates. To date, no one has been hurt by this, but the possibility exists. Always wear eye and hearing protection when using any TNW product.