I have the G36 folding stock as well and have the same problem, the main problem is that the pin holes on the stock dont line up perfect with the holes on the receivers. I grinded them out a little bit and it helped but would still break the pins so I started using the clevis pins and they work great.

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A-5 w/ WAS E-grip w/ JCS trigger / Polished internals / Vortex ratchet / Lightning rod / QEPH / X7 cyclone paddles / X7 Hopper / 10" unported black matte finish Palmers brass w/ Apex / M82A1 gas thru mag / Metadyne RIS shroud / G36 folding stock / Raised rail w/ NcStar red dot sight