Eh gang, thought I'd share this with ya's.
Got play in your your receiver, and don't want to use/spend-$ on a "magic-pin"?
Drill a hole in the pin (Careful of depth. If the drill bit goes though to the locking hole without care, the bit could break). Then tap the hole to 3mm. File down the length of the pin, so it's not proud of the receiver.
Then use a 3mm bolt and cone washer (R/C car supplies), and you now have a pin that can compress the receiver together (rather than one that expands, potetially cracking the receiver pivot).
No wobble...solid gun.
Please excuse shite pics.