To make a long story short I have a 15-22 SBR, 6 inch barrel with a SWR Spectre II suppressor. I have ben playing around with different subsonic ammo to find something that feeds and cycles good. So far Gemtec has been the ticket. Remington subsonic fires, ejects and strips the next round but doesn't cycle the bolt far enough I believe to cock the hammer for the next shot. Someone was telling me about a upgraded recoil spring...something about being blue...anyone heard of that and know the details or even how to get one if its true? Any info would be appreciated.....thanks

I'm not sure exactly what the difference in the bolt recoil spring are, but another thing to try is a reduced weight hammer spring.

Also, when S&W made the pistol version of the 15-22 they used a bolt with some material removed to lighten it up. There are pictures here:

15-22 pistol and rifle bolt difference

Not sure if bolt modification is something you'd want to attempt, but it might also help.

JP Enterprises reduced power spring set.

JP Enterprises Trigger Spring Kit AR-15 3-1/2 lb Reduced Power

that is curious that a lot of 15-22's w/cans are picky about SS ammo. Mine, with an AAC Pilot II eats anything that is put in it from rem to American Tactical, to whatever SS is there. mag dumps, the works.

and i barely clean the dang thing! i clean the **** out of the can,but at a maximum effort i run a boresnake through it, and use a rag to wipe the inside w/o breaking it down. think i have had one or two misfires due to bad primer, burt no fault of weapon.

but then again i don't have every doo-dad in the world hanging off it either, just an EOtech EXPS3-0 and G33 magnifier FTS mount, krylon paint job and the can, that's it.

I haven't tried very much ss ammo in the 1000fps and above range just because of availability. I just need to find some different brands to try. I just ordered the reduced spring set to see if that helps. Thanks for the pic's on the difference between the rifle and pistol bolt, doesn't look like that would be to hard to accomplish. Also, I usually lube with that shooter's choice red grease...that might be slowing the bolt down...maybe something like snake oil will be better.

You absolutely do not want grease on the rails or the bolt body. There is no need to put ANY lube on the bolt body itself. The fit between the bolt and the upper receiver is so loose the only impact the lube has is to collect dirt. The only place on the bolt that needs lube is a tiny drop of CLP or similar on the extractor pivot and a very small amount on the bolt rails - a single drop in the rail slots in the bolt is more than enough. The rule of thumb is if you can see the lube, you used too much.

Too many people lube the 15-22 like they do an AR and this is wrong. While an AR may run better wet, that certainly doesn't apply to the 15-22.

Just getting back from vacation....thanks for the info on the lube...I kind of figured the grease maybe contributing to the problem. You are so right about the fit and your not running steel on steel either.