Be mindful when cutting these and the A5 down that they have a long coil spring inside of a metal tube (Bolt return spring) extending well back into the buttstock.
It's much further back than just the exposed top tang of the shotgun and the 'nose' of the butt stock.
If you cut the butt stock down any, you have to leave that portion in tact. Leaves you with a section of butt stock behind the pistol grip but the gun still works.
Remington made Riot guns in the Model 11. I think they were 20" bbl's normally,,maybe shorter, but full size buttstocks.
A5 and Model 11 forends tend to crack. Just one of the 'features' of the design.
It usually comes from the forend being repeatedly tightened down with the forend cap. Over time and with wood being effected with oil (softened) and overtightening the cap, ect, the forend is slightly moved to the rear
There is, at the other end of the forend, a slight inlet in the wood for clearance for the bbl chamber extension.
That extension recoils on firing and then sharply springs forward under spring tension (to eject the fired round).
If that clearance gap is taken up by over tightening the forend as a whole,,then the front edge of the chamber extension slams into the wood each time it comes forward and batters it ,,cracks the wood.
That slight clearance is meant to avoid that contact and any damage to the forend.
Nothing wrong with the Remington Model 11.
About the only thing it has that the FN didn't was the added buffer washer rivited to the inside back wall of the rcv'r. Rem said it was necessary, FN never saw it that way.
Most of the buffers are long since gone from being brittle and cracked. They can be replaced. Some don't bother, many don't even know it was there and gone.
The true 'Whippet' Remington, the shotgun that originally got that nickname in the Remington lineup was the Model 17P (Police)
14 1/2" bbl and pistol grip buttstock (20ga only)
The early editions used a pistol grip stock with the spur or knuckle at the top of the grip to aid in handling. Later production came w/o that feature. Probably more pain in use than anything it offered in handling efficiency.