What Is FRP

If you've been looking at purchasing a silencer for the first time, chances are you have heard the term FRP a few times. But what does it mean? FRP stand for "first round pop". The term was coined to explain the noise level of the first shot out of a silencer that hasnt been used for a while. The first shot out of a silencer is going to be louder becuase the oxygen in the air is around 21% and combined with hot propellant gasses from a rpound being fired, the oxygen content acts as an oxidizer and can create an audible and visible reaction. The time from that initial FRP until another louder shot entirely depends on how long it takes for the suppressor to oxygenate again. It's just a matter of time. While FRP can be significantly louder than subsequent shots, 'how much' depends on the silencer design, firearm, ammunition used, and the environment.

The caliber

All suppressors experience the effects of FRP to varying degrees. That being said, most people will never complain about FRP. However those who do are usually shooting subsonic calibers or a 22lr. High pressure rounds are generally still very loud when supressed and FRP becomes much less of an issue.

Silencer design

The design of a silencer can determine effects of FRP. A silencer with greater internal volume such as a monocore design or silencers with large blast chambers,will have a louder FRP simply due to the fact that there's more initial oxygen available to burn. The bore size can also have an effect on FRP. Many people will use a large bore silencers for many calibers. For example: you may shoot a 9mm out of a .45 or a 5.56mm out of a 7.62mm silencer. Many do this and its fine, there is nothing wrong with it. But by shooting sub-calibers through a larger bore there is a trade off, and its that FRP is far more noticable when doing this.

In conclusion

Honestly, FRP isn't a big deal. Most will never complain about it. But it can be more noticable on subsonic calibers and 22lr. Generally speaking, FRP is also more noticable on monocore designed silencers. The more internal volume in a silencer, such as a blast chamber, the more noticable FRP will be. At the end of the day, FRP is generally not an issue. When looking to purchase a supressor, it should probably be one of your last concerns.

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