[Hectic]

Keep the barrel clean. Add silicone oil to the propane valve befor you screw on the adapter (if you got the airsoft innovation one it came with instructions and oil if no get light weight silicone rc shock oil from a hobby shop or the oil from airsoft innovations. Add a drop or two every 5 or 10 mags))
Not fully familiar with the mp7 but when you tear it down you will sed the contact points. Prolly alrdy have lube on them. Lotta folks use super lube. I usd madbull gearbox grease with teflon