Yes, all Crosman guns come with atleast one magazine.
No, they are too small and will jam the gun. Never try to use metal bbs in airsoft guns or vice versa.
I'd say the Crosman Stinger P9. I'm an experienced airsoft player and have been playing for about 2 years now. I've had my trust P9 for a long time, and it always functions flawlessly. Plus, the P9 has a high capacity magazine which is nice because it makes it easier to load and it holds more bbs. The more bbs= less time loading. The P311 doesn't look like it has this feature.
Probably an Echo 1,Stag-15, Full Metal,m4 Carbine.
No
terminal adapter p311
I just bought one and its pretty easy. for the barrel just use a screwdriver and put a tissue or piece of toilet paper on the end , just make sure the toilet paper dosent get stuck because believe me it takes a year to get out. if you had the same problem as me and the front spring scrapes the slide, to clean the shreds of plastic use a cut clothes hanger wire and put toilet paper on the end. eventually the shreds of plastc will stop appearing as for the spring will be filed down.
Error code P308, signifies a cylinder 8 misfire. Other error codes such as P301, P302, P304, P305, P306, P307, P308, P309, P310, P311 and P312 signify misfires on the cylinder of the last 2 numbers of the code.