Crosman no longer has parts for this rifle. However there are independent shops that repair older Crosman air guns. Crosman offers a free service to locate these shops. see the link below.
See the CROSMAN Link below.
CROSMAN 2100 You can find CROSMAN Parts and manuals at ( see the link below) This should give you a diagram on how to dissamble a crosman 2100.
Best left to a gunsmith
IF it has one it is usually located on the Barrel by the breech. Some of the older Crosmans don't have any at all.
Usually it's on the barrel close to the breech. Unless it's a really old Benjamin and then it may not have one.
Crosman owns both the Benjamin and Sheridan line of air guns. See the link below for the Marauder parts list and the customer contact page for Crosman ( They sell parts for the PCP rifle.)
The breech-loading rifle was invented by Captain Patrick Ferguson of Pitfours, Scotland, hence the Ferguson rifle.
It would be nice to have a left handed model (I'm also Left Handed.) But unfortunately Crosman doesn't make a left handed stock for this rifle. You would have to find a woodworker who makes stocks in order to get one made. I would search the web for "Custom Rifle stocks" and start there.
The Crosman web page provides owners manuals and schematics for most all their rifles on their home page. Click on the link below and go to "Download an owners manual."
Go to ( See the link Below) and find your parts and owners manual for your gun or rifle. Crosman keeps a web page for older airguns.
Crosman makes about 50 different '''RIFLES''' you need to state the model you are asking about. See the link below for Crosman rifle owners manuals
He wasn't American, he was a Scot. The breech-loading rifle was invented by Captain Patrick Ferguson of Pitfours, Scotland, hence the Ferguson rifle.