Two rounds with one trigger pull AR15.

[fliparch]

Has this happened to you? What could cause this and what can be done to prevent?

[69Mach1]

Fixed mag or monster man grip? Was the FCG installed correctly?

[eaglemike]

Upside down spring, the slightly conical one for the disconnector, IIRC from reading here. Someone had said it's not unusual, but it didn't happen to me because I knew to watch for it..... maybe.... maybe I was just lucky...
all the best,
Mike

[Requiem]

accidental bump fire possibly?

[69Mach1]

accidental bump fire possibly?

That's why I asked if he had a MM grip installed. Happened to me the first time out.

[a1fabweld]

Sounds like fun! Just kidding. Pretty serious condition there that you should attend to asap.

[Plisk]

Could just be a glitch with the disconnector.

[Noobert]

wear/tear on fcg?

[speedracer]

Disconnector timing, fires once on trigger pull and fires again on trigger release.

[bender152]

Is the disconnecter spring installed properly?

[Cal-Irish]

.gov is on their way.

Sounds like a reversed disconnecter spring.

[fliparch]

.gov is on their way.

Sounds like a reversed disconnecter spring.

Hahaha...didn't say it was my rifle

[gn3hz3ku1*]

Hahaha...didn't say it was my rifle

was it a lwrc on a nov lower?

[Prowler]

Has this happened to you? What could cause this and what can be done to prevent?

This should start with..."I have a friend that..."

[Jicko]

Could just be a glitch with the disconnector.

A glitch!?

That would have been a federal felony offense glitch.

This is NO glitch, don't fire such weapon until you figured out what's wrong, and made sure that you fixed it.