Product Description This ISMI Hammer Spring is manufactured of Chrome Silicon alloy and designed for competition use, these mainsprings allow for tuning of the Beretta 92 and PX4 full size trigger pulls. ISMI Hammer Spring for Beretta 92 13 lb at MidwayUSA Browse all MidwayUSA deals $4.99 In Stock at MidwayUSA Price verified today Buy Now at MidwayUSA Secure checkout Easy returns or compare prices Amazon eBay Product Details Category Action Parts Brand Ismi MPN 92H-13 Ismi