nice man, if anything a UL Frame is amazing, i don't have one but i've seen some and their amazing. a new trigger is gonna be a good investment. ( Be sure to get a DM / PM not PMR trigger for your M6 ) New DesignZ "NDZ" Sells nice cheap roller triggers that work a lot better than a stock trigger.
Paintball, Skateboard, Airsoft, Apparel and Snowboard Gear at ActionVillage.com
AV sells 0-ring kits and spare parts for the PM6, just look under gun parts and find proto it'll be there. And if you know a place that sells O-rings ( not home depot ) that are sized and in differen't types, Get Viton O-rings they are Rub resistant and greatly increase the life of Bolt, Tank, and other parts of your gun that uses O-rings that Rub.
And after all this, Welcome to the Family, Mustangman made an awesome new Sig picture in the matrix owners forum, or you can use one of the already made ones if u want it doesn't matter.