DPM Recoil Reduction System for GLOCK 20-21-40-41 GEN 4 Captured Version

[Roguer]

I ordered a DPM Recoil Reduction System for GLOCK 20-21-40-41 GEN 4 Captured Version, the non captured version works great for my heavy 10mm loads. Saw this was neater and easier to mount so thought I'd give it a try.

Any one else give this one a try?

[gnappi]

I stumbled on one (captive) for my long slide with extended barrel M&P 2.0 in .357 Sig for a silly price and bought it. I couldn't tell any difference with the Sig, but with all that weight out front and long barrel I was not surprised. So I swapped out the slide and installed the .40 cal. 4 3/4" slide, same deal. I'm not recoil sensitive and wasn't timing splits so maybe that's the reason I could not discern any change in the recoil pulse.

Post your impressions when you get to flesh it out.

[Roguer]

Well I found normal loads of mid power loads do about the same recoil, but the heavy higher powered loads did have the lower recoil felt (to me that is) when I shot them. Think they work by the heavier load the recoil system kicks in more.

[fltbed]

There are a few ways to reduce free recoil energy, (or, felt recoil) in a locked breach pistol and they all require a compromise for the shooter.  From most effective to least:

Compensator.
True compensators are gunsmith fitted to the end of the barrel and have the exit holes honed to no more than .002 over bullet diameter to force as much gas as possible out of the vent ports. The best of these will have truly neutral recoil.
Cons:  They are LOUD!  Reduced reliability with lighter loads.  Best to stick with jacketed bullets.

Weight:
By increasing the static weight (frame) and decreasing the reciprocating weight (slide/bolt) you can decrease the percentage of free recoil energy to a great degree.  CZ Shadow 2 and Sig X5 Legion tungsten frame are good examples of these weighing in around three pounds for a 9mm.
Cons:
They are heavy to carry around.  Some USPSA shooters only holster their pistols when they make ready to shoot a stage, carrying the gun in the range bag between stages.

Modifying the guns action:
Since most of the recoil energy is transferred from the slide to the frame/shooter when the slide hits the end of it's travel, much has been done to try to reduce this effect. 
Heavier springs, hydraulic recoil guide rods, multi spring guide rods and recoil buffers, have been tried with varying degrees of minor success.  Hydraulic systems tend to not work in the cold and polymer buffers are fragile and need to be replaced often.  Heavier recoil springs tend to slam the slide closed harder and in certain cases, cause as much or more damage to the gun than they were hoping to prevent.
Multi spring systems, (from my experience) offer the worst of both by being more fragile and slamming the slide closed harder.
I've actually gone the opposite direction, replacing the multi spring systems on my XD's & Glock gen 4's with single spring, steel or tungsten guide rods.

Jeff

[challer61]

Is there a non-captured guide rod for the G40 Gen4? I'm working up full loads and 9x25 but will also shoot .40

[Roguer]

I put a 22 lb tungsten Gen 3 guide rod in my G-40 with an adapter ring for a dumb line of thought that didn't work out if that helps. I moved it to my gen 3 gen 20L slide I got.

[challer61]

Sorta. What did you like about the LW guide rod in the 40?