See the related link at the bottom of this page to see the Crosman 1088 parts manual.
It would really help if you stated the manufacture of the 1088. So I'm going to guess it's a Crosman. See the link below
See the Link Below and locate the owners manual for your airgun.
The C-11 shoots .177 Caliber BB's not pellets
Gamo Hunter Extreme 1650 FPS - Air rifle .177 Cal Air Force TalonP 900 FPS air pistol .25 Cal Hatsan AT P1 Air Pistol .177 870 FPS The Air Force TalonP is faster in .25 Cal than the Hatsan .177 Cal
I suggest: JSB diabolo, Crosman premier, predator polymag see: http://www.pyramydair.com/pellets
The Air Mag C11 (Airsoft) is designed to shoot 6mm Plastic BB's. The C11 BB pistol is designed to shoot .177 Caliber metal BB's.
Simple. They never made a 1800 model. They did make a 1088 model and a 1861 model. This question bothered me so I kept searching for an answer. I found Crosman made a model 1600 powermatic from 1979-90 it was a BB pistol. Check you numbers again I think your "8' is really a "6". If so, then it's a model 1600 powermatic.
This pistol was made between 1978 and 1984. Crosman no longer supplies parts for this model, But the offer a free service to locate shops that repair older Crosman air guns. See the link below
Crosman still supports this air pistol. See the link below.
Crosman sells parts for the 1377. contact Crosman customer service. see the link below.
Crosman no longer has parts for this pistol. However they offer a free service to locate independent shops that repair older Crosman air guns and rifles. See the link below.