Weird, a thread that's on topic. I must have been away again.
I would personally argue that double chopping wouldn't affect accuracy (in most cases) since that's represented by the loss of range (what was once a Diff 20 (medium range) is now Diff 30 (extreme range) and what was farther away is now completely unable to be hit. After all, sawnoff shotguns (leopard guns) go from having a stock and a 28" barrel to being pistol gripped and having a 12" (or even smaller) barrel, which would be a stock chop and a double barrel chop for certain. You can hit fairly easily with them, but not at the ranges you could with a hunting shotgun.
I will say that chopping a gas operated gun (like the venerable AK) is a severe challenge as it requires completely recalibrating the gas blowback system or the thing will blow up. I've seen it done (after all, the Draco pistol is essentially a heavily cut AK) but it would be a much higher check with a lot more time involved. I've also seen (on that one show with the drama and scripting) that the gas blow-back system can be modified to change calibers or make an integral suppressor for an AK.
I don't really know what advantage you would get to chopping a (real) bullpup since the barrel is usually just behind or just ahead of the short foregrip.
I would personally argue that double chopping wouldn't affect accuracy (in most cases) since that's represented by the loss of range (what was once a Diff 20 (medium range) is now Diff 30 (extreme range) and what was farther away is now completely unable to be hit. After all, sawnoff shotguns (leopard guns) go from having a stock and a 28" barrel to being pistol gripped and having a 12" (or even smaller) barrel, which would be a stock chop and a double barrel chop for certain. You can hit fairly easily with them, but not at the ranges you could with a hunting shotgun.
I will say that chopping a gas operated gun (like the venerable AK) is a severe challenge as it requires completely recalibrating the gas blowback system or the thing will blow up. I've seen it done (after all, the Draco pistol is essentially a heavily cut AK) but it would be a much higher check with a lot more time involved. I've also seen (on that one show with the drama and scripting) that the gas blow-back system can be modified to change calibers or make an integral suppressor for an AK.
I don't really know what advantage you would get to chopping a (real) bullpup since the barrel is usually just behind or just ahead of the short foregrip.