If you are going to spend the money and time shooting slower less accurate shots, then why hold back for another $60 dollars that would not only improve your shooting but also decrease the wear & tear on your gun. This makes the investment in ammunition and in your gun not only more enjoyable but a lot more down to the point. What good is investing in a large caliber 15 round pistol if firing it rapidly is going to get you 2 hits out of 15 shots. I'd rather get 5 out of 15 then 2. Your life depends on the probability of apprehending your attacker!
Technology is always changing. I think that there will always be a risk trying it out, but we have to accept that it is a whole lot more percise and assured nowadays. Lately, if something sounds too good to be true it just might not be. I gave the DPM system a chance and it proved a whole lot more than $60 dollars would! I mean 40 years ago the mere thought of a plastic gun would raise laughter from hell.
One might assume it would melt! But they are successful now and thanks to those people who gave it a shot there is now guns like our M&Ps that will soon be widely depended on!
I am confident to say that just like plastic guns became trusted, DPM is the next generation of recoil springs! :idea:
Well, I'd rather hit 15 out of 15 shots. So I practice a lot. Which means springs are a consumable item. At $60 a pop, that's an expensive consumable.
Sure, $60 bucks might be realtively inexpensivecompared to the sum total cost of shooting, but if that $60 investment breaks and causes one to have to sit out a $100 match, it gets more expensive. Add a spare to avoid that, it's now a $120 fancy spring. Not a huge sum, but it's about a case of reloads for me, and that's a solid ammount of practice to throw away.
Multi-stage recoil springs have been around since the late 80s at least. They are just a more reliable way of getting a variable spring rate, and give you the ability to get a greater disparity in spring rates into the same space.
There's the sprinco rod, http://www.sprinco.com/recoil.html
which looks almost idnetical toe the DPM "mechanical" system. There's also the STI recoil master ( see a pic here: http://www.dawsonprecision.com/ProductDeta...0000-1093363050
) which is also basically the same thing except for how they capture the springs. The recoil system in the H&K USP is also basically the same thing. There have been several others in the market as well.
When you add these types of systems to a pistol not designed for them (i.e. consistant factory setup), you can get functioning. Even if they functiuon perfectly, they make the front sight move funny IMO.
I'm NOT dismissing these types of things without having tried them. Heck, I've OWNED two guns with two stage recoil springs in them and have shot both of them a fair ammount. Except in compact guns where both springs are under some load with the gun fully in battery, I find them to be more detrimental to fast shooting than a plain old straight guide rod as they make the front sight track oddly.
If I wanted to switch to one, I'd probably go spinco as they are in the US, have a more mature product that went through growing pains, and have some guys I know are OK people vouching for them. Whereas I can't even get the DPM system priced in US dollars.
Multi-stage recoil systems have been around for about 20 years at LEAST. They aren't new.
AS for polymer guns 40 years ago, H&K was designing them 40 years ago basically. Such as the H&K vp70z and p9s.