I run a completly stock ciener kit in an 14.5 socom barrel on a Colt factory M16 lower, modded the M16 hammer so it would not dip on sear release, runs 100% on CCI blazer hi velocity and CCI standard Velocity and Rem Target 22,
I also run a Ciener with a M1 sales collar adapter and either a spikes dedicated 4.5", 8" or 11.5'" barrel. they would not run well with the ciener anti bounce weight installed, as I was still getting bolt bounce and light FP hits
, so I modded the bolt to accept the spikes anti bounce ball and detent and now they run 100% without the ciener weight
I run CCI Standards or Rem 22 target out of the 11.5" and 8" both suppressed and unsurpressed, and CCI blazers both suppressed and unsurpressed out of the 4.5" barrel, as the blazers are subsonic in a 4.5-5.5 inch barrel.
I run stock springs in both the ciener and M16 lowers. I could not be happier with Ciener kits or the CCI ammo, although it would be nice if you could get the ciener kit with the ball detent mod from Ciener.
I know this didn't answer your question exactly, but I also have a spikes bolt, but it has ejection issues so I haven't messed with it, I would not buy a complete spikes upper, I would buy one of their barrels though, and get my own stripped upper and a ciener kit with a collar adapter and trip (no weight) and do the ball detent mod, and get the spring and ball from spikes