Here's another trick. First, take your punches and just scrape off the remains from machining on all the holes in your receiver. Drill bits work too, but a small punch will do the trick just as well. Next, get some Tetra-gun grease (Wal-Mart has it for like $4 per tube) and cover all your pins and your holes. RRA receivers are known for being a bit on the "tight" side. They're machined to very exact specs for all the parts to fit securely. Also, their receivers tend to be a bit thicker than standard ones. This makes for a very accurate and durable rifle but makes construction a bit harder. Finally, for all your pins, do not use a standard hammer because you might damage your finish. Instead, get a 16 oz rubber mallet and tap in all your pins. You won't damage anything using that light of a mallet, the rubber makes sure you don't scratch up your receiver, and it allows you to generate much more force than using your fingers or palm. Hopefully that helps. If not, RRA's got a lifetime warrenty.