Hello group - I've been a Mossberg owner for several (30+ years), starting off with a 500 Cruiser back in the old Army days. Currently, I've got a 9200A1 and I've just purchased a 930 SPX Slugster. The 9200A1 has an issue with not wanting to eject shells after firing and I want to try to fine a mag tube extension and a pistol grip stock for the SPX... Any help? Any ideas?