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I have a M300 on my 590 and a M600 scout on my M4. Honestly, the M600 does not seem to have twice the lumen output @ 1000 vs 500 for the M300. It's brighter but, not twice as much. Anyway, I think the scout line are fantastic lights, bombproof.

I have the Surefire M300C on the IWC mount. Got it as a combo (light and mount) from Earl. I bought it back in December and he had them in stock then. It's 500 lumens and plenty bright enough for my needs and it's light weight. I've found that much brighter is too much, unless you're trying to light up long distances.

Okay...I called Benelli today. After being thrown around on hold and waiting 15 minutes (I felt bad for the operator, she sounded like this was a college job for her and I could all but feel her cringe when I said "Hi, you put me on hold and I waited 10 minutes and the system directed me back to you". Completely understandable, but I work with people all the time and always have, so I empathized...ANYWAYS>..) Benelli finally got to me on the phone. I was informed that there is ONE! spring for the M4. It's part number is:70053 But wait... I have seen part number 70052 bandied about on this forum as well! Is benelli misleading me? Well, I asked the nice lady to punch in 70052. Turns out this is the part number for the mag tube itself. SOCOMguy is correct. There is only one factory spring for the Benelli M4. It is meant to go with the factory 5 OR 7-shot tube. I am going to go and test things out with the Benelli follower and stock spring, as it is what SHOULD be in there according to Benelli. (Also, I find it quite telling that it has MORE tension on the last round than does the SRM M4+2 spring they sell with their kit. All evidence points to the rep I spoke to at Benelli being correct). Also, if you look at the "extended spring" on the e-guns site that is recommended with their extended tube ( TUBE: http://www.e-gunparts.com/DisplayAd.asp?chrProductSKU=981490&chrSuperSKU=&MC= SPRING: http://www.e-gunparts.com/product.asp?chrProductSKU=981390&MC= ), its Benelli part number: 60479 (acertained by a call to E-guns). According to Benelli (and E-guns when you click on this part number), this item fits: M1/M3 Super 90 and is a factory type spring. NOT extended capacity (which Benelli only offers if you get a +4 or larger extension, and not at all for the M4 model). I have thus spoken with 2 Benelli Reps and both of them have told me 70053 is the ONLY spring spec'ed by Benelli for the M4. Reguardless of the mag tube. The fact that I have not found any other spring online made by Benelli for the M4 confirms this. There you have it, 1 hour of my day spend fiddling with mag-springs and data to put this to bed.

I like the KZ version. It is just a larger version of the factory knob. Have abused it in a few classes and it runs fine. https://www.botach.com/kz-benelli-m4-ergonomic-3x-oversized-charging-handle/