What gun are these barrels for?

[compulsivegunbuyer]

The Glocks and the S&W are obvious, but what are the barrels with the arrows? The chamber on the one looks to be a 22

[SkyHawk]

Could be Erma Werke 22 Luger clone EP22 or KGP69, the one on the left especially looks like it. Some of them have the little LCI notch and some not.







Here is a partial shot of a barrel assembly from mine

[compulsivegunbuyer]

Thanks