Glock Slide Pull/Slide Assist - for Glock 9mm, .357 Sig and .40 S&W - Slide Pull by Brass Stacker Glock 9mm, .357 Sig and .40 S&W The Brass Stacker Slide Pull (Patent Pending) features a comfortable, low profile, ergonomic design with sleek look and strong, large pull ring. It does not obscure your sight picture and is easily acquired, even in darkness. The Slide Pull will not snag on clothing and does not interfere with most holsters. The Slide Pull securely clamps to slide serrations.