Mossberg 500 into a Mossberg Shockwave.

Good question since the Mossberg persuader is sold as a PGO.

In the long run it would be cheaper just to buy the Shockwave. You would have the initial cost of the Mossberg Persuader plus you would have to purchase the birds head grip, barrel and a new fore end. The fore end on the Shockwave is shorter than what Mossberg uses on the standard 500.

12Bravo20 said:

As long as it has never had a stock attached to it AND was sold as a PGO firearm then yes.

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You would have to install the Raptor grip first. Personally, I'd just skip cutting the barrel at that point.

entropy said:

No. As defined by the ATF, and as recorded on the Federal form, a "Cruiser" type shotgun is a shotgun, even without a buttstock ever having been attached, due to barrel length. Once defined as such on the 4473, it is a shotgun. And putting a Raptor grip on an AOW does not change it's status either, it is still an AOW.

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18 USC 921 (a)(5): The term “shotgun” means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of an explosive to fire through a smooth bore either a number of ball shot or a single projectile for each single pull of the trigger

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The "cruiser" is a "firearm" just the same as the shockwave. It was not "designed or redesigned, made or remade, and intended to be fired from the shoulder". The Cruiser needs the 18" barrel to not trigger the 26" length restriction of an AOW. Swapping to a birds head grip and a 14" barrel (in that order, if you want to be technical about it) maintains the non-shotgun status and avoids status as an AOW.

If your FFL recorded a "cruiser" as a shotgun on the 4473, he is wrong. It is an "other". Which, incidentally, is why a person under 21 can't buy a "cruiser" from a dealer.

entropy said:

No. As defined by the ATF, and as recorded on the Federal form, a "Cruiser" type shotgun is a shotgun, even without a buttstock ever having been attached, due to barrel length. Once defined as such on the 4473, it is a shotgun. And putting a Raptor grip on an AOW does not change it's status either, it is still an AOW.

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That's interesting because I thought that any gun classed simply as a "firearm" was just that, not classed as anything else, not a shotgun, rifle, AOW, etc.

Before I forget I want to make everyone aware of another legal concern with these types of firearms.

If you conceal a Shockwave or similar firearm, it instantly becomes an unregistered AOW.

entropy said:

No. As defined by the ATF, and as recorded on the Federal form, a "Cruiser" type shotgun is a shotgun, even without a buttstock ever having been attached, due to barrel length. Once defined as such on the 4473, it is a shotgun. And putting a Raptor grip on an AOW does not change it's status either, it is still an AOW.

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Absolutely not correct.
A firearm with a pistol grip that expels a shotgun shell (like the Mossberg Cruiser) DOES NOT meet the definition of "shotgun" in Federal law......it's simply a "firearm". It would be marked as "Other Firearm" on the form 4473. It would be legal to install a Raptor style grip and chop the barrel shorter as long as overall length exceeds 26".

George P said:

That's interesting because I thought that any gun classed simply as a "firearm" was just that, not classed as anything else, not a shotgun, rifle, AOW, etc.

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Correct.