[Benelli M4 6 position Recoil Tube]

On 7/20/2022 at 8:39 AM, RxArms said:

I just took a bit of a deep dive into QPQ finish.  And from what I can see, briley seems to be skipping the notch heat treat, and instead relying on QPQ finish (quench polish quench), which is a type of case hardening (I am only coming to this conclusion based on the info on their website)

QPQ case harden depth ranges from 0.04mm - 0.45mm.   And boasts a 60-70 Rockwell hardness from what I can see online.   

I am deciding to go with an actual heat treat on the notches, precise and repeatable technology via computer programming, which will give a case hardened depth 2-3x that of QPQ, of 1mm-1.5mm 55-60RC.  For me, I value depth of the hardened case.  when we are talking about anything above 55 RC it is all very hard.  PVD finish I am going with has a hardness of 3300 HV.  Which I am guessing is over 100RC.  I can’t find a conversion table that goes that high.. this finish is only 3 microns thick.

Those are the major differences when it comes to heat treat and surface finish.

 

that is very informative man i love this information that you shared 

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On 2/9/2014 at 7:12 AM, AVATactical.com said:

Gentlemen -

 

After a long hiatus from meaningful shooting (Very busy time of year for my day job), I was able to finally get out this weekend to do some significant round count.

 

Background is testing with the new Surefire slick sided lights, namely the Fury series. Previously I did some quick testing with snap rings, shrink wrap tube and the results seems positive but I wanted to get a lot of rounds down range using something even more common that I suspected would work and be a bit more scientific about it before I reported back.

 

On this same issue I worked with a client who is on this board, I won't name them publically unless they wish to talk about it as well, on a replacement sling ring which is shaped to prevent movement on the Fury lights as well. Before having any made, I wanted to test these other methods and gauge interest.

 

In any event, here are my results...

 

I put over 400 rounds of buck shot, and another 200 or so of Walmart bulk-pack down the M4 today with a P2X Fury simply wrapped in plain old duct tape with witness marks on it to show any movement.

 

Here's what it looked like when I got back to the house to take a picture of it:

 

 

Even the buck was 100 pack from Gander Mountain, so it's not the heaviest of 3 in mags, but I can't imagine if this many rounds did not move the Fury anything would or could.

 

 

 

I can't see any movement in the witness marks. If there is any at all it's so negligible, it can't matter.

 

So that's my results. I wouldn't expect anybody to use duct tape like this, but if you put it on your light or mount and trim it you wouldn't be able to see it. Or you can use black shrink wrap, anything that interferes with the slick on slick surfaces.

 

This is the cost of when we combine slick aluminium lights (this being the first ones I have ever dealt with - I am sure this fury series will slide around in most other mounts as well because they are slick as well) - in slick surfaced mounts. Most mounts are designed to grip the cross hatching on lights absent on the Fury.

that is very informative man thanks for sharing, i love it