I have several 18” shotgun adapters for 12 gauge. These are amazing to turn a cheap break action into legitimate hunting rifle. I have tested these to 200 yards with great results. I have 45 colt, 450 Bushmaster, .410, 400 Legend, they cost $150 with shipping. I would sell for $120 or $400 for all four. I have some ammo in these calibers I would sell with them. I have also a 12 ga break action Nomad for $200, so for $600 you could have a 12 gauge a .410, a deer rifle, an elk Rifle, and fun plinker. All in the same gun.