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That was 13/14 years ago. ATF letters don’t mean much anyways… ask Bumpstock, Armbrace & rarebreed trigger owners.

Hi All: Rumaging around on the Internet for these manuals is kind of a pain, so I'm linking them to this forum from my Google Drive. These links should be good forever, unless Google goes under or the Internet disappears: USMC Technical Manual (TM 10698A-10/1): Operator's Manual for Shotgun, Combat, 12 Guage Semi-Automatic M1014 1005-01-472-3147 November 2000 18410698000: https://drive.google.com/open?id=0BxN5CusgXy6nbm1udXh5dzYyYUU Benelli M4 Product Manual M4 (comes with the shotgun): https://drive.google.com/open?id=0BxN5CusgXy6nNmlRcGxjWEpOaXM ENJOY!

Was the recoil spring tube ever removed from the gun previously? The aluminum recoil spring tube is a 21MM design which has been used in the SBE 1 original design USA version, most if not all H&K SBE 1's used a 19 MM design, all versions are locktite in place. If you had the recoil spring replaced at some point it was more than likely done improperly.