I've tried several buffer/action spring variants and always return to the stock HK system.
Also, read above about ejection throw applied to the HK system vs. a standard DI.
Last edited by InshallahTech; 09-27-2017 at 02:44 AM. Reason: clarification
If HK had to make a hood to cover the disco due to excessive bolt speed on 10.4" guns with no vent that are running the full power HK spring and 5oz buffer because of the impact damage caused by bolt speed overcoming the hammer spring strength and causing the rear of the hammer to impact and damage/break the disco, this is what we call a clue.
I also ran an A5 system with a sprinco heavy spring for a short time and it still didn't match the performance of the stock HK system. Running an even weaker spring is simply asking for trouble. It also makes it apparent that you don't have enough rounds downrange with the gun to have developed a true understanding of your rifle.
I guarantee you that I've more experience in matters of weapons function then you. It's been my job both CONUS and OCONUS on a wide variety of weapons, ordnance and launch systems since 2004. Personal experience in the AR style platform goes back over 20+ years.
You might want to secure your ego for a bit and actually listen. If you don't fully understand a mechanical system and how the primary and secondary function indicators express or are to be interpreted, you find yourself in the position you are in now. What you are doing is pretty much like trying to diagnose how a car is running by how well the door opens.
Apparently you look good on paper, but you're clearly lacking in this situation otherwise you'd know better.
My experience has primarily been with ( but not limited to) high round count military weapons in war zones and advanced pre-positioned stock. I've had more full auto guns of all variety go through my hands then you've probably personally laid eyes on much less shot. I've spent quality time with real world end users of the 416 in afghan as well as have owned and currently own 416's and MR556's with multiple barrel lengths. I'm pretty sure that i'm one of maybe two or three people on this form capable of doing a full gauging on the AR platform in its entirety, including depot level QA and inspection.
Your "colt armorers certificate" is meaningless in the greater scheme of this discussion, especially since you don't understand the relative interaction of HK parts vs. standard DI parts in function interpretation. You may be able to apply DI troubleshooting techniques to the majority of aftermarket piston platforms, but that does NOT cross over into the realm of HK guns due to the entire ground up revision of the system.
Like I said, I know I've got a bit of an ego, but I've earned it and while on the outset the things I say may appear grating and rude, but in the end, the point is to help and educate. otherwise I wouldn't post at all and just let people run their guns into the ground.