Problemes with a Stag Model 8 on a Slide Fire Stock

I purchased a slide fire stock a few weeks ago and have ran it on two different direct impingement upper receivers and never had any problems with it. I just purchased a Stag Model 8 piston upper receiver in .223 caliber and mounted it on the same lower receiver I have used on the other two DI uppers with the Slide Fire. I can not get the slide fire to run reliably. Most of the time it will only cycle 2-3 rounds. It will then eject the spent shell and load a live round but will not be cocked. I am puzzled on how the bolt can go back far enough to eject the spent case and load a live round yet not be cocked. I have got the slide fire with the piston upper to run about 10-12 rounds without stopping but like I previously stated most of the time it will only run 1-3 rounds. When you lock the stock on the slide fire to shoot the gun in a normal semi-auto position the upper will perform flawlessly and run a 30 rounds magazine as quick as you can pull the trigger. I have switched out lowers and it will still do the same thing with the piston upper. Do you all have any idea what may be causing this? Like I said if I put a DI upper on the gun it will run flawlessly. Is it possible for the gun the eject the spent sheel and load a live round without cocking the gun? I have spoke with Slide Fire and they said it may not have enough recoil. I am running a stock buffer and spring as well. Any ideas or suggestions?

i was thinking about getting the same upper and a slide fire stock. Hopefully they can work together.

How is it possible for it to eject the spent shell and load a live round without cocking the hammer? Any ideas what could be causing this?

bump

bump, any body else using the stock with a model 8

Here is one possibility:

The hammer is following up due to excess carrier speed creating carrier bounce. This means that when the carrier slams home to chamber the round, it then bounces back just enough to basically "decock" the hammer without allowing the firing pin to be struck. I would try a heavier buffer weight to see if that solves the problem. If you are using a standard carbine buffer, try an H2.

The buffer weight is likely your issue.

Back from the dead...

What was found to be the issue or solution here?

Thanks.

I just gor an adams upper and have the same problem, so has anyone tried a stronger buffer? and what were the results. I would not want to buy ban H2 buffer only to find out that it doesn't work. Thanks

Me three. I'm running a 5.45x39 adams upper. Running 4 ounce buffer. Can get one or two rounds off, then round chambered and hammer follow.

I have the same problem as you. I own three Slide Fire Stocks and they have been installed on the different AR's. One is a Stag G3, an S&W M&P 15T, and a Bushmaster AR15. All three firearms are doing the same thing, I can get a two, maybe three or four round burst, then the action stops, decocked, with only a slight depression on the primer from the firing pin. I have used Federal, Black Hills, and Remington ammo, all 55gr, FMJ. All with the same results, in all three AR's I own.
I wish someone could tell me why this is happening!!!!!
I've emailed Slide Fire and they are quick to respond, but blame this type of problem mostly on match triggers, all of mine are mil-spec.
All the videos on YouTube show folks firing full 20 round bursts, or even 100 round drum. Are all these videos produced by the Slide Fire folks using full auto weapons? Would make a Hell of a sales pitch.
I can't get any of my AR's to fire full 20 round clips using any type of ammo. Maybe that's why the Feds haven't banned them, their too busy laughing their asses off at the fools buying them!
Someone correct me if I'm wrong, but you better be able to tell me how your Slide Fire works for you, or I'll consider you a Slide Fire insider perpetuating the BS.

Based on the way a Slide Fire works, I can see some possible issues with piston guns as you are literally "shaking" the shit out if it and with a piston gun you have parts moving back and forth with a certain amount of "designed in" velocity to make it work. Shake it back and forth and you upset that balance. You don't get that in a DI gun. As far as do they work, yes they do. I shot a few of them on several different AR's, all DI guns, and I could easily control the rate of fire up to full 30rd mag dumps. One of the guns owners had a 100 rd drum and emptied it fairly quick, stopping only a few times to regain sighting. I was impressed enough that I ordered one for myself that same weekend. Now I sit here with my own Slide Fire stock but I have yet to try it. I just finished the rifle build this week that I'll be using it on and have'nt had the time to even test fire the rifle yet, let alone see how it does with the slide fire. Its not a piston gun though, went with a Spikes NiB lower and DI upper with a BCM mid length I barrel. I was hoping to try it out this weekend but that got nixed cause I'm on call this weekend. Can't say no to extra pay and OT, thats what keeps me in this game. :)

II had the same problem with my adams arms upper and changed buffer with no luck. Then after shooting about 500rds I tried it again with the slide fire stock and I have not had a problem since, so maybe it was a break in problem .

I don't know but it works just fine now I did put the original standard buffer back in so I am saying breaking it in did the trick.

Hey guys, new to the site always a browser never a poster. Ran across this because ive been having problems as well. Got a slide fire and ran it on my lmt defender upper on a plum crazy lower. FYI it was a di serup. Thing ran awesome went thru about 1200 rounds with no problem except that I was broke from ammo cost. So I tried to run it with tula ammo. Worked about 20% of the time with Tula. Problem wasn't the gun but more the round. 223 has little to no taper to the case and I had some extraction issues. My mind started to wonder how to proceed. I then ran across a smith m&p upper in 5.45x39 for $299 And for that price I couldn't pass it up. The price of the Russian surplus ammo was just what I was looking for to make slide fire fun and not a major hit to the wallet. With the better taper to the 5.45 I anticipated it helping with extraction issues. Put the wolff xp hammer spring in the plum crazy lower and went to town. Worked good with the Russian surplus corrosive stuff, had occasional ftf due to light primer strikes that just got worse. I found the problem was the plastic hammer In the plum crazy lower. The hammer was getting an indention were it impacted the firing pin. Changed out the trigger group to the dpms metal components. I was also getting sick of having to clean the crap out of the thing after every day. The corrosive ammo is just a B!tch in a di ar. Dedcided to go piston while I was working on it and dropped in the Osprey defense ops-416 piston. (FYI this thing rocks, super easy install neat design) took it out shooting again and just to add insult to injury the damn thing didn't work at all with the slide fire now!!! Semi operation was fine but the slide fire would dump a few rounds then light strike. I was about to trash the whole idea until i found the enhanced firing pin for the 5.45. Picked up the new pin from black rifle arms and installed it yesterday. I will be shooting it on thanksgiving and will give a report on how it works out. If this doesn't do it there's a good chance that piston guns and slide fire doesn't mix. I will post and let y'all know what the results are.

So how did your Thanksgiving shoot go?
Anyone try this with a .22 conversion? Wondering if it would fire and recoil reliably.

I've always had some issue with getting a slide fire stock. I think this is another. In my opinion, it sounds like the AR version of "limp wristing" a pistol. I could be way off, but it makes some sense to me.

Sorry it took so log for me to get back to this, been busy at work. The firing pin fixed all my problems on the 5.45 upper. The slide fire now works but it is a little more finicky with the piston. I'm actually planning on building another upper chambered in 5.45 but running DI just for this purpose but running chromed everything so i don't have to worry about corrosive ammo. A DI 5.45 upper is still the fastest cycling slide fire driven gun I've shot.

I run mine on a piston upper - 10.25'' with Noveske Pig - Adams Arms kit. It hammers pretty well - I was having the same problem. I gave it a major oil treatment with rem-oil - bolt, piston, etc and was able to do a 50rd dump with my C-mag.

I am going to play with different buffers - maybe a drop in trigger with different hammer springs....???

LUBE YOUR BOLT!

One of my co-worker friends just put together a PSA lower with Adam Arms 16" upper and it has a Slidefire stock. He has shot about 500rds through the gun and loves the way it works with the stock.
Definitely a happy camper with its function.

Ok, now that I've been messing with it for a couple of weeks - Lubrication is key. Also, get a ST-T2 buffer - it will stop your carrier bounce. Step 3 is take out a loan to afford to shoot the damn thing.

Now I'm just waiting on Adams Arms - shook so hard I lost the button, E clip, and detent that hold the piston block/stop in place.

Also, Tighten all screws (Sights, grips, accessories) - Sh#t is going to loosen up and fall off.

I have a Spikes Tactical 5.45 that worked great with the Slidefire. I got tired of the tedious chore of cleaning the BCG so I went to an ATI piston kit with a new Spikes phosphated BCG. I went with the new BCG because I didn't want to separate the gas key from the NiB bolt carrier..On a side note, not too sure how well that NiB coating is as it was coming off the carrier rails. Spikes took care of it with a re-plated BCG. We'll see how it holds up in my next 5.45. Anyway, bump firing not working so good now. I changed to a POF roller cam pin and I've always lubed it good. Now it works a little better but runs a lot slower than the DI set-up. I have about 500-600 rds through it with the piston. The gun had about 1000rds previously with the DI set-up...I'm going to see if it needs more break-in and maybe change out the buffer, but I'm also making a gas conversion set-up so I can change out the piston and go back to DI when I want to do some bumping without any problems.

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