# Must the caliber appear on a homemade firearm? **URL:** \ **Category:** Legal & Second Amendment\ **Created:** [May 30, 2022, 4:03pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386 "2022-05-30T16:03:06Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Mike270](https://avatars.discourse-cdn.com/v4/letter/m/3da27b/32.png) [@Mike270](https://community.usconcealedcarry.com/u/Mike270)\ **Post date:** [May 30, 2022, 4:03pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/1 "2022-05-30T16:03:06Z")
Must the caliber appear on a homemade firearm? ---
**Author:** ![Dave17](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/dave17/32/15053_2.png) [@Dave17](https://community.usconcealedcarry.com/u/Dave17)\ **Post date:** [May 30, 2022, 4:17pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/2 "2022-05-30T16:17:42Z")
Not that I am aware of. One does not need a serial number on a firearm manufactured for personal use, either, even when selling it. Do you have a source stating whether or not it is necessary? [https://www.atf.gov/file/58681/download](https://www.atf.gov/file/58681/download) ---
**Author:** ![Larry130](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/larry130/32/38689_2.png) [@Larry130](https://community.usconcealedcarry.com/u/Larry130)\ **Post date:** [May 30, 2022, 4:23pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/3 "2022-05-30T16:23:52Z")
Here’s what the ATF says: [https://www.atf.gov/firearms/firearms-guides-importation-verification-firearms-ammunition-firearms-verification-overview](https://www.atf.gov/firearms/firearms-guides-importation-verification-firearms-ammunition-firearms-verification-overview) And checkout the last sentence on page 1 of this: [https://crsreports.congress.gov/product/pdf/LSB/LSB10733](https://crsreports.congress.gov/product/pdf/LSB/LSB10733) You may have to cut and paste these into your browser. ---
**Author:** ![Dave17](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/dave17/32/15053_2.png) [@Dave17](https://community.usconcealedcarry.com/u/Dave17)\ **Post date:** [May 30, 2022, 4:31pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/4 "2022-05-30T16:31:50Z")
None of which address firearms manufactured by an unlicensed, private citizen for personal use. ---
**Author:** ![Larry130](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/larry130/32/38689_2.png) [@Larry130](https://community.usconcealedcarry.com/u/Larry130)\ **Post date:** [May 30, 2022, 5:34pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/5 "2022-05-30T17:34:05Z")
Actually, the CRS Report is quite specific in that area. ---
**Author:** ![Dave17](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/dave17/32/15053_2.png) [@Dave17](https://community.usconcealedcarry.com/u/Dave17)\ **Post date:** [May 30, 2022, 6:11pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/6 "2022-05-30T18:11:42Z")
Yes, it is: > By statute, **FFLs** are required to “identify by means of a serial number engraved or cast on the receiver or frame of the weapon” each firearm manufactured in, or imported into, the United States. Existing regulations establish more detailed requirements for how the serial number must be affixed, including the minimum depth and print size, and require additional information such as the firearm model, caliber or gauge, and the **FFL’s** name and business location. ---
**Author:** ![mattm](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/mattm/32/178411_2.png) [@mattm](https://community.usconcealedcarry.com/u/mattm)\ **Post date:** [May 30, 2022, 8:45pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/7 "2022-05-30T20:45:55Z")
Heck, look at your AR lowers, where it often says “caliber: multi”. In a.nutshell and ime…no. ---
**Author:** ![Mike270](https://avatars.discourse-cdn.com/v4/letter/m/3da27b/32.png) [@Mike270](https://community.usconcealedcarry.com/u/Mike270)\ **Post date:** [May 30, 2022, 8:49pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/8 "2022-05-30T20:49:39Z")
My AR is not homemade. ---
**Author:** ![mattm](https://sea1.discourse-cdn.com/flex015/user_avatar/community.usconcealedcarry.com/mattm/32/178411_2.png) [@mattm](https://community.usconcealedcarry.com/u/mattm)\ **Post date:** [May 30, 2022, 8:56pm UTC](https://community.usconcealedcarry.com/t/must-the-caliber-appear-on-a-homemade-firearm/82386/9 "2022-05-30T20:56:43Z")
Precisely. You have a s/n,but possibly and probably “multi” for caliber on your lower, as you can run any of 7 differently chambered uppers…Home build, you don’t even need the s/n in most states.