![What does the plunger button do on M4s/ARs (the little pushy button thing behind the chamber sticking off to the side)? - Quora What does the plunger button do on M4s/ARs (the little pushy button thing behind the chamber sticking off to the side)? - Quora](https://www.californiacarry.org/uploads/5/4/2/6/54262223/bb_orig.png)
What does the plunger button do on M4s/ARs (the little pushy button thing behind the chamber sticking off to the side)? - Quora
![A Heckler & Koch VP 70 Z in cal. 9 mm x 21, in its carton, No. 93307. Matching numbers. Bright bore. 18 shots. Proof-marked 1986. Ramp front sight. Button safety. Two-line A Heckler & Koch VP 70 Z in cal. 9 mm x 21, in its carton, No. 93307. Matching numbers. Bright bore. 18 shots. Proof-marked 1986. Ramp front sight. Button safety. Two-line](https://c8.alamy.com/comp/TATY2G/a-heckler-koch-vp-70-z-in-cal-9-mm-x-21-in-its-carton-no-93307-matching-numbers-bright-bore-18-shots-proof-marked-1986-ramp-front-sight-button-safety-two-line-company-name-with-modified-calibre-specification-slide-phosphated-dark-grey-black-polymer-grip-frame-with-metal-inserts-in-matching-numbered-original-carton-with-spare-magazine-instructions-and-test-target-a-rare-collectors-item-from-a-total-manufacture-of-merely-400-weapons-brand-new-erwerbsscheinpflichtig-civil-handgun-civil-handguns-handheld-gun-guns-firearm-f-additional-rights-clearance-info-not-available-TATY2G.jpg)
A Heckler & Koch VP 70 Z in cal. 9 mm x 21, in its carton, No. 93307. Matching numbers. Bright bore. 18 shots. Proof-marked 1986. Ramp front sight. Button safety. Two-line
![HK VP9 Push Button 9mm 4.09'' 17-Rd * NO CREDIT CARD FEE * - Semi Auto Pistols at GunBroker.com : 962308841 HK VP9 Push Button 9mm 4.09'' 17-Rd * NO CREDIT CARD FEE * - Semi Auto Pistols at GunBroker.com : 962308841](https://p1.gunbroker.com/pics/962308000/962308841/pix006304851.jpg)