Crossman P1322 Pump Mods?

I’m looking to mod my Crossman 1322 into a better small game gun. Hope to take pigeons with it in the future too. Currently I have the original gun unmodded with the extended stock. Got it for free at my winter camp. I’m curious if there’s a better pump grip and mechanism. If you know of any, please let me know.
 
Check out "Alchemy Airwerks." Alchemy's eBay store is "needful things." He's got everything you need, I'm modding my 1377 with similar plans in mind, and I bought a bunch of hop-up stuff from him. Once finished, mine will be a carbine with an 18" barrel, left handed breech, flat top piston and valve, and a higher flow transfer port. Once finished, I'll likely post some before and after results. As far as the fore grip/pump arm: check out the "backpacker" pump arm. It's beefier, and makes the gun easier/more comfortable to pump.
 
"Mentolio"Check out "Alchemy Airwerks." Alchemy's eBay store is "needful things." He's got everything you need, I'm modding my 1377 with similar plans in mind, and I bought a bunch of hop-up stuff from him. Once finished, mine will be a carbine with an 18" barrel, left handed breech, flat top piston and valve, and a higher flow transfer port. Once finished, I'll likely post some before and after results. As far as the fore grip/pump arm: check out the "backpacker" pump arm. It's beefier, and makes the gun easier/more comfortable to pump.
Do you know where I can get or how I can make some stock inserts? I really want to recreate this picture I see of the stock.