Quoted:
Could someone please post pics of the various hand grips on a Colt AR. The reason I ask is I have read where there are skinny and fat ones. I believe that the skinny ones were on SP1's? I am wanting to know only about factory Colt models. Thanks in advance, if this is the wrong forum please move to the correct one.
Could you clarify your question, are you looking for rifle or carbine Colt factory handguards?
The skinny and fat round/ oval section ones are the carbines, skinny are the original and the fat are M4 type current issue/ production.
There's some pics here in the Retro AR forum USGI Colt Carbine tacked thread, if you want to see rifle handguards see the USGI Colt M16 Series Variation Guide tacked thread.
USGI Colt Carbine Parts Variation Guide - tacked thread link