Has anyone used the sliding stock that turns their M&P 15 into a legal (according to the BATF) automatic? I saw a video on youtube and was wondering if anyone had anymore input?

Yes, I sure 'nough do have some input for you. I tested one yesterday for the first time, using one of my five AR-15 type rifles, in this case a Sendra lower and early A1 type full length upper with Vietnam era Delta handguards.

An FFL friend had to order 20 kits to get a discount, so at his request I agreed to kick in for one, really just out of curiosity, as I already have a registered '28 Thompson for my full auto entertainment.

My impression of the video? I suspect they may have had to go to some trouble to set up the rifle and trigger pull, and do a number of takes, to get a video clip worth putting up. The system is not really very practical. Yes, you can possibly get your AR type rifle to fire very fast now and then, maybe, sorta, but you will have almost no control over where you would like those expensive rounds to go, and whether it will work "this time" like in the video.

No way in the world will it compare to an actual select fire weapon, where you have much more control, particularly on-and-off trigger control.

All it does is prove that you can "sort of" fire a semi so fast it sounds like a full auto, sometimes, maybe, but that's the extent of it. It might be a gee-wow novelty for you and your friends at the range one time. After that...

I happen to have one right beside me on a chair as I spotted this thread. The stock looks kind of cheesey and trashy to my eye. It could easily have been made to look more conventional and attractive, but they chose not to.

Your action must be set up just so, to slide freely in this odd stock. Your trigger finger must be on the "finger rest" just so, to make it work. Your forward pressure on the forearm, using the left hand, must be just so. And by the way, a left hander could not use this system, the way your right trigger finger must be supported by a forward "finger rest" molded into part of the shoulder stock.

No way in the world could you be doing the several things necessary to make this rig bump fire, while at the same time aiming it well enough to hit something smaller than a nearby barn. It's a noise maker, nothing more.

Your finger, fixed firmly in one position and resting on part of the synthetic stock, is actually "pulling" the trigger for each shot. So you are not really firing full auto. But sometimes it sounds like it.

Maybe.

...while the gun bounces to and fro about 9/16", maybe; if you are holding it just right and doing everything just right, and...well, you get the picture.

My guess is that the people at ATF who tested this thing and granted the approval letter, saying it is not a "firearm", within the definitions set forth in the law restricting full auto weapons, must have been chuckling a lot. They knew that letter was not going to result in anybody going out and doing much of anything that is practical or needs regulating.

The truth is that you can take an AR-15, or any other semiauto firearm, set up the trigger so the pull is no more than a couple pounds, hold the grip firmly in the right hand, and rapidly move your left trigger finger forward and backward in the trigger guard to accomplish the same thing. BUT THIS CAN BE DANGEROUS, and I don't recommend it...especially with a handgun, where your fingers may be very close to the muzzle. It's kid stuff. It accomplishes nothing, and you cannot safely control where the bullets go, as with this latest monstrosity. These are the things accidents are made of.

By now, I'll bet you can guess whether I suggest that everybody should run right out and buy this quality product.

Worst of all, it costs about as much as you will pay for a nice classic S&W shooter grade revolver, which actually does something and will hold its value.

thanks for the great review OhioPhil. from what you've said... not even worth fiddling with. i guess i didnt even think about the amount of ammo it would take to get this thing under control.

im on an AR forum and while i have never used this, i have read reviews from several veteran members who say this slide is pretty cool, and have NOT had the problems that phil had.

they recommend buying it. it takes a few rounds to perfect but they say the accuracy is phenominal for a weapon shooting as fast as automatic.

like i have said i have read SEVERAL people say this stock is worth the buy if you can afford ammo to feed it full auto that is. these are people i know well and trust their opinions. sorry for the contradictory review, but it is what it is. i say go for it, just because ONE person couldnt get it to work, shouldnt make you pass on it.

its about the same as bump firing from the hip. but with great accuracy.

i do however suggest if you do buy it, to be ready for lots of police contact and funny looks while shooting it, as "machine gun sounds" will draw lots of unwanted attention, just something to keep in mind. if you live in the middle of nowhere, not too much to worry about, if not, you will get hasseled.

also, batfe can backtrack and take back their approval at anytime, its been done before (look it up) , and you will be screwed on the purchase price, as it will then become illegal and have to be destroyed with no refund, just something else to think about.

hope that helps your decision.