Der Upper kommt auf das Kunststoffteil , wird arretiert und dann kann man den Block in den Schraubstock einspannen und dran arbeiten ohne das der Upper einen Kratzer ab bekommt !
Passt nicht bei OA und HK (da KEIN MilSpec)

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Protect Receiver From Damage When Clamping
Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective cleaning, assembly, and repair. Unbreakable urethane vise block takes all the clamping force, so your expensive lower receiver won’t be damaged or distorted. Insert block into the magazine housing from the top or bottom, then clamp the other end in your bench vise. The magazine catch locks to the block, safely and securely holding the rifle for assembly, disassembly, cleaning, or repair. Will not mar or scratch the finish. Fits tightly in most receivers and may require filing to fit others.
SPECS: High-density urethane plastic, black. 5" (12cm) high, 2¼" (5.7cm) wide, ¾" (19cm) thick.
Passt nicht bei OA und HK (da KEIN MilSpec)

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A Polymer Armorer Block for Basic AR Gunsmithing
Tired of wrenching on your AR-15 while it’s just laying on your workbench? Cleaning, maintaining and upgrading an AR can be a frustrating job if your rifle isn’t secure, so Crosstac developed this precision-machined Armorer Block Kit, which is a must-have for any AR-15 owner looking to tinker with their rifle. This Crosstac Armorer Block Kit is made from polymer, which makes it lightweight and ideal for basic work, like mounting brakes, suppressors, scopes and more. However, the polymer construction means that this kit isn’t ideal as a foundation for an AR build, since the block can only handle up to 30 foot-pounds of torque. For those looking to do builds, the Crosstac modular block system is a better option.
Passt nicht bei OA und HK (da KEIN MilSpec)

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Protect Receiver From Damage When Clamping
Heavy-duty blocks allow you to firmly clamp AR-15/M16 receiver halves in a vise without risk of crushing, twisting, or otherwise distorting them when applying vise pressure or torquing the barrel nut. Keeps your rifle secure for safe, effective cleaning, assembly, and repair. Unbreakable urethane vise block takes all the clamping force, so your expensive lower receiver won’t be damaged or distorted. Insert block into the magazine housing from the top or bottom, then clamp the other end in your bench vise. The magazine catch locks to the block, safely and securely holding the rifle for assembly, disassembly, cleaning, or repair. Will not mar or scratch the finish. Fits tightly in most receivers and may require filing to fit others.
SPECS: High-density urethane plastic, black. 5" (12cm) high, 2¼" (5.7cm) wide, ¾" (19cm) thick
Nicht für AR10!
Passt nicht bei OA und HK (da KEIN MilSpec)

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Nicht für AR15!

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• Provides the Means to Install and Remove Parts Often Replaced and or Reinstalled on Both the AR15 and AR308 Platforms such as: Standard A2 Flash Hider, Delta Ring Assembly, Rifle Length Buffer Tube, Carbine Buffer Tube Castle Nut, and More
• Equipped with UTG PRO Super Slim Free Float Barrel Nut Wrench and Compatible with 1/2" Torque Wrenches
• Includes a 3/4", 7/8", and 3-Prong Wrench Slot for Installation and Removal of Most Muzzle Devices and 3 Prong Flash Hiders
• Includes a 5/8" Wrench Slot and Flathead Screw Driver for Installation and Removal of Rifle Length Buffer Tubes and Fixed A2 Stocks, as well as, a castle and jam nut wrench
• Steel Construction with Wear Resistant Phosphate Finish for Long Lasting Durability

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• Provides the Means to Install and Remove Parts Often Replaced and or Reinstalled on the AR15 Platforms such as: Standard A2 Flash Hider, Delta Ring Barrel Nut Assembly, Rifle Length Buffer Tube, Carbine Buffer Tube Castle Nut, and More
• Equipped with Dual 1/2" & 3/8" Torque Wrench Socket Adaptors for Quick Compatibility with Common Shop Torque Wrenches
• Includes a 3/4", 7/8", and 3-Prong Wrench Slot for Installation and Removal of Most Muzzle Devices and 3 Prong Flash Hiders
• Includes a 5/8" Wrench Slot and Flathead Screw Driver for Installation and Removal of Rifle Length Buffer Tubes and Fixed A2 Stocks, as well as, a castle and jam nut wrench
• Steel Construction with Wear Resistant Finish for Long Lasting Durability

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aus Stahl
Plenty Of Leverage For Quick Barrel Removal & Installation
Heavy-duty wrench provides plenty of leverage for installing and removing barrel nuts when used with a 3/8" or ½" drive breaker bar, socket wrench, or torque wrench. Cut from 3/8" thick steel, with plenty of metal so it won’t flex under pressure while transferring the torque evenly to the nut. Models available for AR-15/M16, ArmaLite®. Armorer’s AR-15/M16 model has a built-in 10"-long handle for convenience, plus additional holes between pins help with proper gas tube alignment. Still includes 3/8" and ½" drive cutouts.

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aus Stahl
Plenty Of Leverage For Quick Barrel Removal & Installation
Heavy-duty wrench provides plenty of leverage for installing and removing barrel nuts when used with a 3/8" or ½" drive breaker bar, socket wrench, or torque wrench. Cut from 3/8" thick steel, with plenty of metal so it won’t flex under pressure while transferring the torque evenly to the nut. Models available for AR-15/M16, ArmaLite®. Armorer’s AR-15/M16 model has a built-in 10"-long handle for convenience, plus additional holes between pins help with proper gas tube alignment. Still includes 3/8" and ½" drive cutouts.

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Brownells new AR-15 Armorer’s Wrench works with either encapsulated or peg-style barrel nuts. The long handle ends with a carbine buttstock wrench that features four teeth that ensure full engagement of all four notches in an M4-style receiver extension nut for easy removal and installation. Also includes a 1/2" square drive opening for torque wrench application, 5/8" and 3/4" slots to fit receiver A2 receiver extensions and flash suppressors.

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