The ROOK Tactical G17 Front Locking Block Rail Upgrade for a Polymer Pistols of the 80% variety is a precision machined piece designed to overcome the weaknesses and tolerance issues associated with the standard Metal Injection Molded parts. Proudly Manufactured in the USA utilizing a proprietary metallurgy Stainless Steel this is one upgrade you don't want to miss out on. 
 
*This Locking block fits Polymer 80 PF940V2 PF940CL and PF45 frame only
 
** At this time we are unable to offer a discount code on these parts but we will be working diligently to reduce their price as the volumes increase.
 
**DOES NOT FIT GST-9 Model