RE: help with 1187
Hi I'm a new guy to this forum, in fact this is my first post. I've been shooting an 11-87 for the past 15 seasons and have not had a problem with mine ever jamming.
The first thing I'd suggest is as mentioned above be certain the piston/ring assembly is installed correctly. And that the magazine tube is clean.
That said I never use oil on any of the internal working parts of the gun. Oil has a propensity to attract dirt that may lead to problems. Not to mention that it can give you a bad time in very cold temps.
Remington "dry lube" does a decent job and won't allow added build up from poor quality powder or other gunk. Graphite powder also does a fine job of lubricating moving parts.