AGP Arms SIG556 Folding Stock

AGP Arms SIG556 Folding Stock

SKU:
AGP-SIG-FOLDINGSTOCK
$140.00
(28 reviews)
Current Stock:
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Description

Here is the AGP push button side folding stock for use on the SIG 556. If your model has the AR style threaded buffer end of the receiver, this kit will fit.  The stock features a removable end cap that allows for storage in the tube section.  You are able to store your proper paperwork, cleaning kit, batteries, etc in this section. 

The kit comes complete with the stock and hinge and all the billet adapters to mate with your lower receiver, anti-rotation plug.

Optional 1/2" or 1" butt pad.

Length of Pull:

No Buttpad - 11.75"

1/2" Buttpad - 12.25"

1" Buttpad - 12.75" 

Will not fit the newer 'Classic' model that had the hinge built into the receiver. If your 556 has a factory folding stock, this product will not work. 

Available in Black

Instructions

Reviews

  • 5
    good product

    Posted by Bill on 18th Sep 2025

    Fit perfectly. Took minutes to install. Solid, no slop.

  • 5
    Great

    Posted by Dylan on 16th Aug 2025

    A lot cheaper than the original product. However, it still fits the retro look and feel at a fraction of the price, but it's still a high quality

  • 5
    AR stock

    Posted by RAZ on 8th Aug 2025

    Well built, a little tough getting the folding joint moving but a little oil and a vice clamp got it rotating. Installed well. I LIKE it.

  • 5
    556 folding stock

    Posted by Dogstar on 7th Aug 2025

    I installed on a 556 swat pistol . Rock solid . Easy to install . The only thing complaint is the length of pull is very short . I bought a couple butt pads , shaved one down flat as a spacer and used longer screws to install . Came out good .

  • 5
    Rifle stock

    Posted by Nicholas Wolkonsky on 26th Jun 2025

    Perfect fit on my Sig 556 pistol

  • 5
    Was easy to install and has great fit and quality.

    Posted by Happy Customer on 24th Mar 2025

    This is a great product for adding a folding stock to a Sig 556 with the AR15 buffer tube. The quality is great and it was easy to install.

  • 5
    Was easy to install and has great fit and quality.

    Posted by Happy Customer on 23rd Mar 2025

    This is a great product for adding a folding stock to a Sig 556 with the AR15 buffer tube. The quality is great and it was easy to install.

  • 5
    Folding stock

    Posted by Sig 556 swat on 21st Mar 2025

    Perfect fit good quality

  • 4
    good with only 1 flaw

    Posted by Marshall L on 16th Feb 2025

    the stock feels good with the 1/2inch butt pad but my only complaint is there is no way for the folding stock to latch to the side of the gun and so the stock just falls open when closed