The Crosman 1088 Pellet/BB is rated at 400-430 FPS
What condition is it in. That determines the value
What model is it. How old is it, what condition is it in, is it still working?
Depending on caliber, they can ragne from 4-28 grains.
6.2 Lbs without scope
It would help if you stated the model of the pellet gun you need parts for. I can tell you this much. Both Daisy and Crosman made pellet guns for Sears under the JC Higgins brand name. If you want to try to locate a repair shop that restores old pellet guns I suggest to look on the web under "Air Gun Repair." and locate someone who repairs older pellet guns. Or you can re-post your question with the model number it will start with one of two sets of numbers like 799 or 126. This will identify it as either a Daisy or a Crosman air gun. Crosman offers a locater service to repair older guns. (If yours is a Crosman.) It's up to you how you want to find parts.
Crosman made the pellet and bb guns for Sears starting in the 50's I am not sure when they stopped, I think probably sometime during the 70's. Sounds like you have a variation of the pumpmaster Crosman, so best guess, is if its older, anywhere from $50-$100. You can probably check on Crosman Forums, and get a better suited answer there. Hope it helps.
If it's a pellet gun them most pellet guns are capable of killing a squirrel. Check the FPS (Feet per Second) and if it's over 400 FPS that should be sufficient. Expect to pay $60 and up for a pellet gun. Crosman makes an excellent pellet gun that is rated at 610 FPS Called the American Classic and it cost $70. I also suggest using Hunting (Hollow point pellets) these will be the most effective.
the Crosman Model 400 was made in two variations. The first was made between 1957-62 the second was made between 1962-64. It's a .22 caliber pellet rifle. Without more information about the condition of the rifle it is not possible to give you and estimate of value.
Crosman and Daisy made air rifles for Sears under the JC Higgins name. Yours is a model 400 Crosman. However you did not state the condition of the rifle so no estimate of value can be given. However yours was made between 1957-64.
The drozd is rated at 541 FPS. there is not much that you can do to improve it because it's a BB gun and the Co2 will only push the BB so fast. With a pellet gun you can select a lighter pellet to make it faster or a heaver pellet to make it hit harder. BB's all weigh about the same so you don't have much choice. However you can put your BB's in a can and drop a few drops of Crosman pellgun oil in with them and roll them around in the oil to coat the BB's with oil. Also put a few drops of oil down the barrel this will make the BB's fire faster down the barrel. DO NOT SOAK the BB's it will gum up the gun with too much oil
200 or so ------------------------------------------------- The slowest BB gun ( NOT Airsoft or Pellet gun) that I know of is the Marksman 1010, it is rated at 200 FPS. The fastest BB gun I could find is the Crosman 2100 that is rated at 755 FPS. This gives you an average of 477.5 FPS Pellet guns and rifles can attain much faster speeds.