What to expect ??

Just wondering what type of performance gains I can expect with these mods on a Crosman P1322?

Adjustable Sear Trigger Spring, Added a larger shoe to trigger.

Steel Breech, RP Performance Valve, Boss 25% larger Transfer Port, Power Hammer Spring, 14.5" barrel. Barrel band, and a Compact 4 x 20 scope.

Soon going to add Walnut pistol grips and fore arm handle along with brass muzzle brake.

Some are for looks and comfort others for performance. Was also wondering if there is anything else that can be added ( not going to make it a rifle 14.5" barrel is it ) such as for ex. extended bolt to help seat pellet better.