Tiger Rock AR-15 - 6 Position Collapsible Stock Kit MIL-SPEC

Manufactured by Tiger Rock
SKU: ST007M-ST003M
MPN: ST007M-ST003M
Manufactured by Tiger Rock
12 Reviews
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The Tiger Rock Stock Kit is the perfect way to finish out your lower receiver without breaking the budget! The lightweight and durable 6061-T6 aluminum 6 position receiver extension is proper mil-spec dimensions to accept a wide variety of after market stocks. A coated carbine spring and 3oz buffer help ensure smooth and reliable function. This collapsible buttstock kit is an excellent choice to finish building your Mil-Spec AR-15 carbine.

Kit includes
  • End plate
  • Castle nut
  • Mil-Spec 6-position buffer tube
  • Carbine spring
  • 3oz Buffer
  • M4 style carbine stock.

Founded in 2011, Tiger Rock Inc is a smart choice for a wide variety of superior quality sporting/firearms accessories.
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BrandTiger Rock
Manufacturer.Tiger Rock
MaterialAluminum - 6061-T6
Sling Mount1.25 in Sling Loop
StorageNot Storage Capable

WARNING: This Product can expose you to chemicals which is known to state of California to cause Cancer and Reproductive Harm. For more information, see www.p65warnings.ca.gov

California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Good low budget buffer tube assembly.


Decided on a low cost lower AR15 build .
<br>So I chose a Tiger rock buffer tube , buffer and stock plus castle nut .
<br>Everything fit as it should
<br>Came with everything except buffer . detent but I had that already .
<br>Good product for low budget build .

Good value for the price

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I bought this on sale for an extra lower I had laying around that didn't have a stock. Typical GI stock. The stock fits fairly tight on the extension. Spring and buffer is typical carbine. The quality seems fine. Everything is GTG.
<br>Great value for the sales price of $20.

Maybe for ten bucks

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I bought this on sale just for the buffer tube, figuring what the hell having spare parts never hurts. I've built a lot of AR's, this is the cheapest crap I've ever bought. Where to start.... The end plate was partially finished/phosphated on one side. The end plate is also bowed, as in when completely tight against the receiver, I can see that it's bent and I can see a coil of the detent spring peaking out at me. The spring and buffer appear to be spraybombed. The buffer tube isn't all that bad, threads are cut well and after torquing and untorquing a few times they don't appear chewed up. I guess it's surprising a stock fits on it. Even more surprising the stock included with the kit fits on the tube!

I Would recommend this for anyone.


Got this for my first ar15 build was easy to put together nice quality, installed with no issues.

Worse than I thought

by -

A new discovery to my previous review: Castlenut will not fit on any other tube. Different castlenuts on the Tiger Rock tube are extremely loose. To the trash can it goes!

Not too bad.


Good for the price, looks like end plate is a little bowed but it straightened out fine. castle nut n buffer tube fits together nice. Stock has that little wobble all the standard GI stocks have, What im really impressed with is Primary Arms. Ordered this at 3pmCT on a Thursday and got it Saturday. Their shipping department kicks ass!

Good Bet for Your Money

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So far so good. Bought this assembly to complete my lower. I don't think you can beat the price if you are on a budget. Everything fits tight and nothing was bent. I will update if needed when I complete my build.

It works...

by -

Pros: everything fit perfectly, the stock doesnt have very mutch wiggle like the other standered m4 stocks.
<br>Cons: End plate is slightly bent, the buffer tube came with a scratch on it, the buffer spring is very stiff. The end plate pokes out a little bit from the top causing the charging handle to scratch agianst it.
<br>All in all it works and im going to use it, but for 40$ i expected it to be better than a made in china kit that i could have picked up for 25$.

Threads didn't hold

by -

The price was right for the moment. But I guess you get what you pay for. The threads stripped on the buffer tube and I had to replace it.

Don’t bet your life on it.


I thought I’d take a gamble but I was disappointed with this kit. The spring is painted and the gauge of the wire appears smaller than my other buffer springs, it’s also longer. The finish molding on the stock is poor. This kit is actually made in China. For this price (albeit on sale), I expected better. Primary Arms shouldn’t be allowing their customers to install this kit on any firearms, especially folks new to assembling lowers. Find a kit from a reputable manufacturer. I put this in the trash so it never ends up on a firearm.