It's been too long but I think I'm finally going to get back into playing. I check in here from time to time but havn't been involved. Due to all this covid crap, buying a house, winter ice storm taking out a bunch of my trees, blah, blah, blah, excuse, excuse, excuse... I haven't had much time for airsoft. Hopefully I'm back at it this summer. I ordered the enhanced spring and heavier buffer from Samoon for my GHK M4. I wanted more recoil, and I got it.....It's friggen awesome. I'm sure there is a cost to this though, other than gas efficiency. As expected it did hurt gas efficiency, but I can still get two mags off without a refill unless I dump an entire mag. To be honest....if the gas in any mag lasts long enough to run through all it's BB's without refill and does it consistently, I'm happy with that. My question is how much damage, if any am I doing running this? Anybody have experience with this kit? Are my internals gonna start to crap out super fast? The bolt catch is noticeably harder to depress when releasing the bolt because of the additional spring pressure. I actually emailed Samoon about this and they said (possibly due to a translation error) that it shouldn't be like that, possibly I installed it wrong...I'm thinking I didn't....lol. I email them again and they never responded to that one, I'm actually surprised because usually they are super responsive to all inquiries. Anyway, I'm just worried about possible excess wear and tear, or killing the thing prematurely..