My CA M15A4 SPR (full metal) just has an upgraded spring and piston...I have had NO problems, It has a crazy ROF and shoots consistently hard and accurate. The spring has settled to about 380 FPS now. The thing never jams.
I have put about 8000 rounds through it without a complaint from the rifle. CAs are great, decent price. After upgrading it and everything it has cost me 750. Why buy a Systema when you can get really good quality at a price like that? That being said, I do want a Systema... but I dont think I will ever get one
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