To tell you the truth, my house gun has a 22in vent rib bbl. with tubes. I leave the cyn tube in it. But I took it out last dove season when my 1100 broke. I put a mod chock tube in it and tore the birds up. And with an extra full, I can put 7 out of 15 pellets on a deer size target at 50 yards with 3in 00 buck. The one thing you have to think about is how a lawyer can turn things around in court if you have to use the gun. If you have your gun set up to out shoot a police gun, you could be seeing yourself in jail. And if you shoot at someone out to, or near 20 yards you will go to jail, unless there shooting at you. So in the long run, I think its best and cheapest to stay with the 18 in cyn. bore cop gun. Thats my 2 1/2 cents.