NDZ PerformanceSafety Replacement Kit for Mossberg 500 590 88 835 940 12/20 Aluminum - Ball & Steel Plate Complete Kit - Choose Color & Kit

Works good and great quality! Came with all the parts I needed and installation guide. Fit perfectly!

Anodize is good quality on Aluminum slide safety. You should use the original ball detent if you don’t LOSE IT! My slide was plastic, did not contrast the frame and I like the ‘thumb tab’ on this item. Form, fit and function ‘spot on!’You can install it without full disassembly but it’s VERY ‘dicey!’AS usual make sure it’s empty blah,blah,don’t be stupid, blah.Mine had a ONE WAY flat blade screw. You can force it out by applying HUGE arm pressure while turning (reverse) BUT YOU MUST have an EXACT FITTING [right width and length] and the edges MUST BE S-H-A-R-P to BITE into the “ramp” of the screw. You need a high quality blade like KLIEN etc. My screw is Hard Steel black oxide and was loctited. You need to push in at least twice as hard as you twist too!DO NOT REMOVE THE SCREW ENTIRELY or the part will fall into the frame! Unscrew just enough to be able to turn the slide sideways VERY SLOWLY as you need to “catch” the spring loaded detent BALL at the rear under the slide. Got to catch the spring too!!! REMOVE both the ball and spring WITHOUT removing the Slide yet. {Even knowing this I still pulled he screw all the way out and dropped the part myself. You can turn the gun upside down and shake it while using something to manipulate back into place.}HERE IS THE TRICK: Make sure you pull the Safety slide all the way back to “SAFE” and pull on the trigger with CONSTANT PRESSURE. You will ‘feel’ that the Safety Slide INNER PART becomes “held in place.” If you slide it forward, it becomes loose and you will drop it into the frame. Play with it to get a feel. Also some may require you to ‘cock’ the gun but of course make sure you are not stupid and it’s loaded blah, blah etc.PREPARE THE NEW STUFF and it would be smart to get a second person to help while you disassemble and re-assemble. Now that you got it held in place by trigger force, unscrew the original slide and have someone remove the Hardened Steel Dentent Plate that is under the Original slide. Have you helper put the Plate on the New Slide, place the screw in it and the Allen driver in the screw for you. Make sure the plate and new slide are oriented correctly to each other and the frame operation position. The “thumb tab” goes oward the Stock as well as the detent Plate. ALL WHILE STILL HOLDING THE TRIGGER start the screw into the INNER PART and tighten until it snugs down just a little with the SAFETY SLIDE “CROSS WAYS” on the frame so you can access the SPRING/BALL DETENT hole. Again this is a little exciting as you NOW LOOSEN the screw some, install the spring AND set the Detent Ball on top of the spring and then CAREFULLY ROTATE the Safety slide over top of the Spring/Ball Detent. You may need some fingernails to push Ball down some to get it under the Detent Plate. I can’t emphasize enough the delicacy of this procedure so as not to lose anything!!! Once you get it all in place, tighten it down and MAKE SURE IT OPERATES PROPERLY numerous times before loading it up. {I did this by myself as no one around and DROPPED THE DETENT BALL into the frame as the INNER PART moved forward while I was trying to get it under the Detent Plate. After a little tapping back & forth while upside down, it finally fell back out into my lap - whew!}

Easy install. Looks great!

Watched a youtube before swapping. Was easy and the top tap on this makes for several other options to use a finger on it so now - if you use the safety though- there are options on how to apply it when handling the shotgun. Happy with the investment so far - used it for a while now.

I put it on Mossberg 600ET 410. Project sits a little high but nothing a Dremel won’t fix.

Really like thise safety and especially for the cost. Makes manipulating the safety so much faster.

I have ordered NDZ products in the past they are of high quality I have never had any issues with a ease of installation they make things very simple to put in most items are very simple to put in but if there's any question about it it's pretty much step by step I use this to replace the safety on one of my firearms in our shop it was easier to grip onto with your finger then the stock one was making it much easier to use in the field as long as NDZ stays in business I will always purchase products from them

A well made replacement safety switch for a Mossberg 500, or in my case a New Haven 600CT, which is a rebranded 500 sold by department stores back in the good 'ol days. The kit I purchased contained the mounting plate and steel detent ball, but I really only needed the safety switch as it turned out. I found that when it was mounted with the tab farther away that it interrupted the sight picture some when off safety, but it is a shotgun so probably not a major concern. I ended up turning it around and mounting it that way which I liked better so it worked out.