Gas Auto experts please weigh in:
Several years ago I purchased the Walmart version of the Beretta 390 with synthetic stocks. When I bought it I remember firing a couple boxes of dove loads w/out problem. I then tried it during the cold of duck season and had problems cycling rounds. It would fire the first shell, eject it, and hang up with the new shell about 50% toward the chamber. I went back to my trusty 870 Rem express and it stayed in the gun cabinet. At some point along the way, I had the forearm nut drilled to except a sling swivel. This year I have been determined to get the 390 back in action....I have cleaned it thoroughly, tried "dry" teflon lubes, etc., without success. Whether its a heavy steel duck load or a "heavy" lead dove load, it fires the first round and either doesn't eject the empty round, or it empties and doesn't completely chamber the next round (with all the ammo brands I've tried)
I have a couple ideas as to the problem. I'm wondering if having the forearm nut drilled with a free floating stud to accept the sling swivel somehow messed with the gas system. Also, in looking at parts diagrams for this model, the spring on my gun that fits under the forearm nut doesn't have a plate on one end (perhaps this makes the gas flow too unrestricted decreasing mechanical intertia of the bolt). Anyone have ideas? If my description is unclear let me know and I will provide part numbers for those I've mentioned...
dave
Several years ago I purchased the Walmart version of the Beretta 390 with synthetic stocks. When I bought it I remember firing a couple boxes of dove loads w/out problem. I then tried it during the cold of duck season and had problems cycling rounds. It would fire the first shell, eject it, and hang up with the new shell about 50% toward the chamber. I went back to my trusty 870 Rem express and it stayed in the gun cabinet. At some point along the way, I had the forearm nut drilled to except a sling swivel. This year I have been determined to get the 390 back in action....I have cleaned it thoroughly, tried "dry" teflon lubes, etc., without success. Whether its a heavy steel duck load or a "heavy" lead dove load, it fires the first round and either doesn't eject the empty round, or it empties and doesn't completely chamber the next round (with all the ammo brands I've tried)
I have a couple ideas as to the problem. I'm wondering if having the forearm nut drilled with a free floating stud to accept the sling swivel somehow messed with the gas system. Also, in looking at parts diagrams for this model, the spring on my gun that fits under the forearm nut doesn't have a plate on one end (perhaps this makes the gas flow too unrestricted decreasing mechanical intertia of the bolt). Anyone have ideas? If my description is unclear let me know and I will provide part numbers for those I've mentioned...
dave