PSA Magpul STR lower Build Kit fitment

[Trbo6gn]

So i'm starting my newest build and ordered the STR build kit from PSA. I went to install the stock on the buffer tube and i can't for the life of me get it to lock into place. Has anyone else had this problem with the STR kit? They gave me a dummy round that is supposed to be used to align the stock when installing but it almost seems that maybe PSA provided the wrong buffer tube....

 

[huesmann]

It's not the wrong buffer tube. The locking system on the STR and CTR is a huge PITA. I could never get the dummy round to work.

If you can at least get the stock started on the buffer tube, and you work the adjustment lever, you'll see that the lever pushes against something. What you gotta do is jam something (I used an Allen key) in there and crank the lever. That should get you enough "space" to slide it over the end of the buffer tube.

Found a video: http://www.youtube.com/watch?v=Mj4vAno_h5A

Check around 3:40 or so. The lever pushes the black metal pin down, but not enough for you to get the stock over the end of the buffer tube. I'm not strong enough to pull the pin down any further than the lever can crank it, so I crank the lever, then hold the pin down while I release the lever and jam my Allen key between the lever and pin. Then I release the pin, and the Allen key gives me enough leverage to crank the lever and get the stock over the end of the buffer tube.

 

[smdub]

I have a CTR & ACS-L. Just pull the pin down w/ your fingers. Its not hard (I'm not a big guy) though I can see how some w/o as much finger strength or small hands could have difficulty.

 

[ArchAngel78]

I just put on a ACS-L last night on a mil-spec buffer tube from PSA. It was a bit of PITA but I managed to do it without any tools. Once it is started you really have to pull down on the bar that moves the lock tab. It took me a couple of times to get it.

 

[ObsceneJesster]

If you can't pull it down with your fingers, you could also pry it down with a flat head screw driver.

 

[SSDD]

I've only read of one person getting the dummy round to work as expected. The method that huesmann pointed out seems to be the way to go.

 

[BradMacc82]

I've only read of one person getting the dummy round to work as expected. The method that huesmann pointed out seems to be the way to go.

Make that 2 people. Although I did shear the end off of one of the dummy rounds before I got it to work.

If you have a dud round laying around, use it, it works better than the plastic dummy round.

 

[ecampo]

I got mine on with the dummy round but it would be much easier to just use a screw driver to pry it down.

 

[iHasCrabs]

If you can't pull it down with your fingers, you could also pry it down with a flat head screw driver.

My fingers don't fit in and i pry it down with a flat head with all my magpul stocks

Sent from my DROID RAZR using Tapatalk 2

 

[armed ferret]

Make that 2 people. Although I did shear the end off of one of the dummy rounds before I got it to work.

If you have a dud round laying around, use it, it works better than the plastic dummy round.

3. worked fine for me too.

 

[-Z/28-]

I think I used a screwdriver. I remember it was a pita.

 

[sailskidrive]

Hmm... I'm glad I read this thread, now I know what the dummy rounds are for....

 

[BradMacc82]

3. worked fine for me too.

What's that saying about being at least 10% smarter than whatever it is your working on...

The dummy rounds are a nice touch, but they break too easy.

 

[huesmann]

Yep, and the plastic they're made of is too soft.