![]() ![]() However, HK also offers their Law Enforcement Modification (LEM) trigger as an alternative to the standard SA/DA variants. This means that it is a traditional single action and double action (SA/DA) handgun. My example is what HK has dubbed a V1 (Variant 1). I would be remiss not to discuss the USP’s trigger system and options in this review. Regardless, shooters should not base a USP purchase solely on the recoil reduction characteristics of its spring system. Based on my memory, it may be possible that the felt recoil on the USP is slightly less than your average pre-Gen 4 Glock, but I have yet to fire the two side-by-side. In comparison to my M9, the two are pretty similar in this category. While the USP is certainly a soft shooter, I cannot say that I notice significantly less recoil than is present when firing other handguns. HK has claimed that in addition to reducing stress on the firearm, the spring system also reduces felt recoil by as much as 30%. At the rear-most part of the cycling motion, when the slide is nearly at its rearmost position, the inner spring is engaged as a recoil buffer. When the handgun is fired, the larger outer spring serves as the primary recoil spring. Rather than utilize a single recoil spring and guide rod as was the norm at the time of its development, the USP features a captive dual spring recoil assembly. The recoil system used by the USP is noteworthy. With 9mm ammunition being relatively inexpensive, I will likely stick with jacketed rounds for my USP. This warning in mind, I have heard from several reloaders that cast bullets work fine in these barrels. ![]() Also, lead buildup reportedly can cause damage to the polygonal barrel. Reloaders should take caution when using cast lead bullets with this barrel as according to HK and Glock (both makers of polygonal barrels), cast bullets can cause buildup and may suffer from an accuracy standpoint. The USP is also cold hammer forged, which ultimately makes for a very durable part. Compared to my Beretta M9, the USP does seem to be quicker to clean, if only by a small margin. I can only personally vouch for the claims related to cleaning the barrel. ![]() According to these reports, the firearm survived the test with only minimal barrel bulging. It has been reported that during testing, HK cleared a squib round lodged in a USP barrel by firing another round behind it. Proponents of polygonal rifling claim that these barrels last longer and are easier to clean than traditional designs and that they also offer improved accuracy and velocity. These flats “grip” the bullet as it exits the barrel, rather than cutting into the bullet as is the case with traditional land and groove rifling. For those who are not familiar with this sort of design, polygonal barrels have several flats cut into them that spiral inside the bore. In addition to having a substantial, sloped breech, newer USP barrels (post-1996) have polygonal rifling similar to that found in Glocks and CZ82/83s. ![]()
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