What's the widest the clamp can open? Looking to build an AR-15 upper and need a vise.

The Proton vise is great for precision work like polishing/filing small parts. But I would not put anything larger than a small frame semi-auto in it to do serious, precision work. It has rubber blocks covering metal jaws so you will not get a really tight grip and the table hold down is not exactly heavy duty unless screwed down to a bench.You probably should look at something like the MTM Rifle Sled style frame http://www.amazon.com/MTM-GV30-Gun-Vise/dp/B000KKGQ62/ref=sr_1_14?ie=UTF8&qid=1438055460&sr=8-14&keywords=tipton+best+gun+viseor the Tipton Frame Gun Vise http://www.amazon.com/Tipton-181181-Best-Gun-Vise/dp/B001AT3SCC/ref=sr_1_1?ie=UTF8&qid=1438055816&sr=8-1&keywords=tipton+best+gun+viseTipton makes a less expensive model for around $40 which may be fine for your needs. Also look at the Rousch AR Upper Vise Frame- a nylon jig for holding uppers securely. Certainly worth $15 and also don't scrimp on a good set of punches...http://www.amazon.com/Rousch®-Polymer-Gunsmith-Armorer-Workbench/dp/B00URY2LVK/ref=sr_1_3?ie=UTF8&qid=1438056041&sr=8-3&keywords=AR-15+gun+viseAlso look at the Wheeler Gun Vise http://www.amazon.com/Wheeler-Engineering-Armorers-156224-Delta/dp/B00FSVWKJ0/ref=sr_1_4?ie=UTF8&qid=1438056224&sr=8-4&keywords=AR-15+gun+viseTheir products are not great but for occasional work, the price is right.Hope this helps.

Material	cast zinc
Brand	PROXXON
Item dimensions L x W x H	7.48 x 6.3 x 3.15 inches
Color	Silver
Style	Modern
Item Weight	2.08 Kilograms
Tensile Strength	500 PSI
UPC	732454472859 798256207419 744211046845
Manufacturer	Proxxon
Part Number	2228608
Item Weight	4.58 pounds
Product Dimensions	7.48 x 6.3 x 3.15 inches
Item model number	28608
Is Discontinued By Manufacturer	No
Power Source	Hand Powered
Item Package Quantity	1
Number Of Pieces	1
Batteries Included?	No
Batteries Required?	No

Proxxon Precision Vise FMZ with Clamp, Die-Cast Zinc Construction - Ideal for Workbenches & Tabletops - 3-Inch Jaws, 360-Degree Rotation - 28608

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