Put additional weight right where you need it to diminish recoil by simply replacing the guide rod plug. Fully machined plugs come in two models. Standard fits 5", Govt. length slides. Reverse fits STI/SVI factory slides and other slides modified to accept collar reverse plugs.
1911, Issue:10, Page:015
Big Book Catalog, Issue:67, Page:109
New Product Supplement, Issue:494, Page:000
Sinclair, Issue:1A, Page:014
SPECS: Tungsten, silver finish. Standard - 1.4" (3.6cm) long .7 oz. (20 g) wt. Reverse 1.6" (4.2cm) long, .9 oz. (26 g) wt.