Feed chute.



 

I know. It's that it's erroneously in the mag well that I said that. I think a magwell belt would be nearly impossible to make work.

Bored. Decided to ditch the optic for a while. I love this fucking gun...

Well, that was fun.  


I think I'll get a bipod that attaches to the picatinny rail rather than clamps to the barrel.  Quite fun though I can't aim worth a crap with my hand on the receiver like that.  Definitely had a blast though.  

 

I just came.

Thw first burst in video number one was nicely paced.

Man I wish those Beta mags were worth a shit.



The Fostech should be here this week.

I sent my used MWG 90 round in to be fixed. I didn't try to get free work; instead I demanded they charge me since I got it for stupid cheap. ($60).

Apparently they are the real deal and actually function. They look like hammered ass on a regular carbine, but have a certain SAW/IAR charm on a bump-gun thing.

Hey... Not bad! That thing was jumping around a lot... My guess it because it is way lighter than my AR setup and you were on a table. Now I can see why the RPK is so damn long! It keeps the recoil from lifting the front end...

You posted pics, right? I am going to put the video/pic in the OP. Which do you like better?

Edit:

Here is a video that gives people a good idea of how this thing works and hits accurately.

All the weight is to the rear of the bipod. My gun would hop around like that, too if not for the weight distribution.

My left hand is on the rear of the gun not only to push forward aim, but to keep the slide-action from binding up. When I used the slide fire it was a big deal. The Fostech will bind if I really lean on it, but using this position really eliminates the issue. You can get it to bump from any position, but you sacrifice accuracy if you want to do it another way. That's actually just like the SAW was, too.

Please ignore my fat.

It's probably a bit lighter and I'm not bracing very well on the table.  If I lean into it more and get a bipod that clamps to the rail I should improve quite a bit.  I'm also contemplating some sort of red dot for it since the placement of my left hand interferes with regular sights.  



I'm guessing the second video is probably better.  I'll have to get more.    



 

What if we mount the bipod to a chassis that mounts to the stock?  Might have to go to a horizontal forward grip on the off-hand rail.  Bipod mount would be just in front of the magazine well.  The chassis would have to clear the safety and other controls on the lower, and the ejection port on the upper, but could also flow up from the bottom of the pistol grip and wrap around the bottom of the magazine well.  So, say from the stock forward down the left side, over the bolt hold open latch, then down under the magazine well in front of the pivot pin.  Also, from the bottom of the pistol grip forward, around the magazine well to the same location.  It would preclude a Redi-Mag or coupled magazines.

If we go to an upside down side-charger, this gets really easy.  

Skillets and anyone else bumping, can we talk about methods and positions you use to lay the gun in?  Looking to shorten the learning curve on accuracy and function! When I do it I use the saw grip and use the meat of my hand centered on the ch.  I try to make sure the gun is at a natural zero in terms of height and elevation.  I don't  really lock my elbows in, but I try to use them to keep the natural point of aim.  I keep the stock firm in the shoulder.

It sounds like you are on the right path. Let me just rattle off some bullet point advice and take what you want from it.

—Job one of your non-trigger hand is to provide forward pressure to bump.
—Forward pressure should NOT be accomplished using your tricep; instead use your wrist or just the meat of your hand from a strong grip.
—If you have a Slide Fire, you can actually provide the forward pressure by grabbing the "angle struts" on the stock and placing your hand on the CH. Squeeze and it should run. (one of the ways SF is better than the Fostech).
—The Fostech is not as easy to do as the SF postition-wise, but it makes up for it in its smoothness.
—You CAN use your hand on the handguard or mag to bump. It works, (and is better when shooting downhill) but it can cause binding and a loss of control. This thing is like a firehose, let the weight of the gun hold the muzzle and let the slack in the bipod do all the work. The left hand is the most important hand here in this type of shooting. I prefer the SAW grip style.
—Job two of the non shooting hand is to make sure the gun doesn't bind due to an awkward position. All this means is don't bear down on the stock or it will bind up in odd positions like shooting high angles.
—I prefer both of my elbows on the ground. It's more stable. It is not necessary though.
—Adjustable bipods are a good thing. Just like with a SAW, it's not always easy to get the right elevation on your target from the stock bipod settings. Shooting up/downhill is where this REALLY matters.
—I have found that actually pulling through the first round with your finger—rather than pushing the gun into your finger—will produce more accurate and satisfying results.
—I have also found that moving your finger deeper into the trigger guard helps in function. Even with a 5.56/.223 the recoil is enough to make the gun move a lot. Getting a finger in deeper helps maintain consistency.
—If you are going to use coupled PMAGs use the PMAG covers on half way for easy removal. Rounds will fly if you don't. TRUST ME.
—Weight is good with the Fostech, bad with the Slidefire. Both stocks have their pros and cons.

Ask more and I will add more if I haven't covered your questions here.

That's great!!!!

Is this a good time to suggest cross linking this with the Ferguson riots thread?

Nothing says "get off my lawn" like BRAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAP



 

Going to bumpdump tomorrow.  I really get excited about shooting this rifle.  I haven't had this much fun at the range in years.
I figured out the photobucket thing, so I am going to get some vids of the suppressor running hot and got the IR thermometer to take a heat reading on the barrel before I add the JP heat dissipator.  Im also working on a modification for the harris bipod rail mount with a capture pin to allow it to remain fixed for semi and pull the pin and let it walk back and forth for bump.
Thanks again Skillets.

I wish I would have brought my IR thermometer Saturday.  I tried two finger shooting of my SBR with the SD3G installed and a can.  After a few mags the whole rifle was extremely hot and the suppressor was still boiling hot after about 30 minutes.



Two fingers fit just fine in the winter trigger guard, but didn't work well for shooting.  I tripped the trigger too early several times and repeatedly experienced hammer follow.  It was fairly easy to bump the gun from the shoulder with two fingers though - it just led to hammer follow after about three rounds. I may try it on a different lower sometime,my SBR has a LWRC UCIW stock on it with the UC2 buffer and flatwire spring.  I think I might try it on my 14.5" upper and put a spare Wolff XP action spring in it.  Then depending on how that works add a 7.62x39 firing pin and see if it makes a difference.  



 

I'm thinking I need to get out this weekend. I don't plan on going too far accuracy-wise. Probably no further than 200yds.

My buddy and I are doing a temporary swap for optics. I will be using an old Eotech

I plan on doing:

—Traversing fire (Probably not much more that 5° to 10°)
—Fire and movement
—Fire from a barricade with bipod legs closed.
—Fire from the kneeling.
—Shoulder bumping (not too optimistic about accuracy here).

Anything else I should do?

Time your bbl changes.  

...........................

Should be pretty quick if you bring a few spare uppers



 

Ponder this: I only have 4 ARs.***

One is a pistol, one a .22, one is my über$$$ gun, and this one. I am not going to smoke my barrel on my good gun, and I am not going to put a pistol upper on that lower...








***currently going through a divorce. I am happy to even have what I have right now.

Marriage seemingly makes no sense whatsoever anymore.  

Will the .22" bump fire?  You could time a field caliber change when the targets change from hogz to wabbits!  

I'd loan you one if you were close:





 

Is that rifle at the bottom a .50bmg one by chance?  I can only imagine what my shoulder would look like after bump firing it if it were magazine fed.  

 
 

Yes, it's a bolt action single shot .50.  If I had a semi-auto I'd bumpfire it and post video



Have you seen Miculek shoot the .50?  He does 6 shots in .98 seconds - all on target.  If you haven't seen it, it's on youtube.  His V drill video is also really good.



 

Did my first optest with the Fostech last weekend.


Unfortunately, it went kinda shitty but I fault the ammo; I was burning off the last of a batch of Prvi that had been dodgy on several previous occasions.  For example, it was only chrono-ing around 2780 out of my 18" Noveske SPR-ish thing which slings my standard 55gr handloads at over 3000fps.

The bumpfire part worked fine; when I got the rifle to not short stroke, the result was a nice satisfying BRAAAAAAAAPP!!

Fortuitously picked up a beat-to-shit M249 bipod at the funshow yesterday for $15.  It's probably airsoft but I don't really care since I'm counting on the wobbliness to work for me.

A few hours of machine shop time, some minor alterations, and some known good ammo and I should have this beast up and running proper.

Have you tried the x15? 50 rounds wth the height of a 30. And not very bulky either. It's what I plan to run on my buid.

You might open your gas port.  What spring and buffer are you running?



 

I haven't even heard of it. Link?

Oh yeah... I like those, but they are pretty spendy. The Surefire 60 works pretty good, too.

Here is the X15:

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=435478791



I'd like to try one of Armatac's 150rd drums:

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=435260585



 

Nah, the rifle runs like a champ with my usual ammo.  I'm gonna try using that and ditching the H2 buffer before I do anything drastic.


This isn't going to be the permanent setup; just something I cobbled together out of various ARs lying around so I could have a testbed.

So has anyone tried one of these $100 jobbies?



http://www.bumpfiresystems.com/ar15-system/

Not sure how they're not violating Slidefire's patents, unless they're paying a licensing fee or are planning to dispute the patents in court.

Damn...

They have a different letter on their page.

I love watching Jerry's videos.   The man is a machine.  

 

I just IMed that link to a guy buying my SF stock on the EE. It will suck to be the one holding the bag with the overpriced SF stock, but I would hate to be stuck in a shit deal if I were on the other side.

That's the price of being an "early adopter."

+



+



= A pretty cheap way to get into the game.

I want it cause it's so cheap, but god damn I thought the slidefire was ugly...

for the record I was only talking about the stock, actually didn't even notice the gun

Huh... I actually think it's less ugly.

Guess I'm not following how a Masterpiece Arms non-AR is compatible w/ the Bumpfire Systems stock, or cheap?

That stock would mount easy, and it's a piston gun with a side charging handle. Those are things I would like on my gun that would cost extra.

IIRC it's about $800. I would say that's pretty cheap.

I'm not convinced it's compatible w/ any of the AR bumpfire stocks 'til I see one mounted or see measurements.  If the pistol grip is 1/4" too low, a stock AR bumpfire stock isn't going to work w/o mods.

ARs can now be built under $500 - came across a stock of 1800 Sabre Defense lowers - w/ LPK, $100.  That wouldn't work for bumpfire, but you should be able to hit under $550 for a parts AR right now.  $250 buys a 2nd upper.  I grant that's a good price for a piston gun - albeit I understand it doesn't have a bolt hold open.

That is correct, there are some great deals on ARs now. I think the piston is a big plus for me, but the lack of a bolt-hold kinda sucks. I'm surprised, actually.

I personally see that stock installing easy, but I could be wrong.

That is correct, there are some great deals on ARs now. I think the piston is a big plus for me, but the lack of a bolt-hold kinda sucks. I'm surprised, actually.

I personally see that stock installing easy, but I could be wrong.

Ooh, I want one.  Does this have some sort of locking mechanism so you can use it semi auto without any chance of bump firing?

Yep.

The pin in the middle locks it out exactly like the Slide Fire and Fostech.

Please get one and report back—preferably with a bipod.

Make them hurry up with the AK version, too!