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An adjustable spanner (UK, and most other English-speaking countries), adjustable wrench (US and Canada) or a shifter (Australia) is an open-end wrench with a movable jaw, allowing it to be used with different sizes of fastener head (nut, bolt, etc.) rather than just one fastener size, as with a conventional fixed spanner. Several other names are in use, including the US trademark crescent wrench.

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  1. Lazyfaire

    W.A.R. Adjustable Upper

    Very interesting product. This is an adjustable upper that you can turn the switch to turn off the blowback gases. Not inexpensive but certainly adds to a quality build. From Innovative Arms Warfighter Adjustable Upper Receiver
  2. bgdawgrr

    Build Thread  Adjustable brace or folding adapter

    My daughter just got her first AR pistol with an SBA3 adjustable brace. I have been a fan of the KAK Shockwave fixed braces on my AR pistols. Have to say, I really like the SB. I also really like side folders, thanks to my scorpion pistol. Very compact package. So.....for my AR, which do I do...
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