AR-15 5.56/.223 Gas Port Size (Responses)

	B	C	D	E	F	G	H	I
1	What is the brand of the barrel?	If this brand has multiple barrel lines, what line is this barrel from?	What is the approximate barrel length in inches?	What is the gas system?	What size is the gas port in inches?	What was the source of information?	What date was this information sourced?	If the information came from a third party, who was this third party?

2	Aero Precision		10.5	Carbine	0.079	Manufacturer	6/27/2016
3	Aero Precision		10.5	Carbine	0.0785	Manufacturer	7/6/2019
4	Aero Precision	Pro Series	12.5	Midlength	0.084	Manufacturer	10/17/2023	https://www.aeroprecisionusa.com/12-5-5-56-chf-barrel-w-dimple-mid-length
5	Aero Precision		16	Midlength	0.079	Manufacturer	6/27/2016
6	Aero Precision		16	Midlength	0.078	Self-measured	4/17/2020
7	Aero Precision		20	Rifle	0.089	Manufacturer	11/22/2023
8	Andro Corp Industries	10.3 with FSB, Ballistic Advantage	10.5	Carbine	0.070	Manufacturer	7/1/2017
9	Armalite	M-15 LE	16	Carbine	0.068	Manufacturer	2/20/2019
10	AR-Stoner	CMV nitride	10.5	Carbine	0.070	Self-measured	7/20/2017
11	Ballistic Advantage	Hanson	10.3	Carbine	0.07	Self-measured	9/11/2023
12	Ballistic Advantage	Classic Chrome Lined Crane Spec	10.3	Carbine	0.070	Self-measured	2/9/2023
13	Ballistic Advantage	Hanson 10.3	10.5	Carbine	0.078	Self-measured	4/12/2016
14	Ballistic Advantage	Modern Series	10.5	Carbine	0.079	Manufacturer	10/1/2016
15	Ballistic Advantage	Mk18	10.5	Carbine	0.0785	Manufacturer	1/10/2018
16	Ballistic Advantage	Modern Series Government	10.5	Carbine	0.078	Self-measured	11/7/2023
17	Ballistic Advantage	Hanson lightweight	11.3	Carbine	0.070	Manufacturer	12/22/2021
18	Ballistic Advantage	Modern Series	11.5	Carbine	0.073	Manufacturer	2/1/2021
19	Ballistic Advantage	Modern Series Government	11.5	Carbine	0.075	Self-measured	11/7/2023
20	Ballistic Advantage	Hanson	12.3	Carbine	0.067	Manufacturer	8/16/2021	N/A
21	Ballistic Advantage	Modern Series	12.5	Carbine	0.069	Manufacturer	8/25/2019
22	Ballistic Advantage	Modern Series	12.5	Carbine	0.0728	Self-measured	5/13/2021	I used a 1.85mm drill bit from Bisco Tool
23	Ballistic Advantage	Modern Series	12.5	Carbine	0.075	Self-measured	7/23/2023
24	Ballistic Advantage	Modern Series Government	12.5	Carbine	0.075	Self-measured	11/7/2023
25	Ballistic Advantage	Hanson BABL556028F	13.7	Carbine	0.0595	Self-measured	5/21/2021	gas port smaller than USGI TDP 14.5" carbine .0625"
26	Ballistic Advantage	Hanson	13.7	Carbine	0.055	Self-measured	10/11/2021	I used a #54(.055) drill bit shank to measure this. #53(.0595) would not fit. Port had to be drilled to make rifle function
27	Ballistic Advantage	Hanson	13.7	Midlength	0.0781	Self-measured	3/8/2022
28	Ballistic Advantage	Hanson	13.7	Midlength	0.078	Self-measured	1/4/2023
29	Ballistic Advantage	Hanson	13.9	Midlength	0.0785	Self-measured	11/9/2021
30	Ballistic Advantage	Gov't Profile	13.9	Midlength	0.0785	Manufacturer	3/7/2022
31	Ballistic Advantage	Modern Series	14.5	Midlength	0.079	Self-measured
32	Ballistic Advantage	Hanson	14.5	Midlength	0.0785	Manufacturer	3/14/2018
33	Ballistic Advantage	223 Wylde SPR SS Premium Series	14.5	Midlength	0.08	Self-measured	7/27/2023	self, using pin gage
34	Ballistic Advantage	Modern Series Government	14.5	Midlength	0.079	Self-measured	11/7/2023
35	Ballistic Advantage	Modern Series M4	14.5	Carbine	0.063	Self-measured	11/7/2023
36	Ballistic Advantage	Modern - Pencil	14.7	Midlength	0.081	Manufacturer	8/1/2023
37	Ballistic Advantage	Modern Series	16	Carbine	0.625	Self-measured	10/28/2021
38	Ballistic Advantage	Hanson	16	Midlength	0.0785	Manufacturer	3/14/2018
39	Ballistic Advantage	Hanson	16	Midlength	0.073	Manufacturer	7/15/2018
40	Ballistic Advantage	Hanson, .625 GB	16	Midlength	0.073	Manufacturer	7/15/2018
41	Ballistic Advantage	Modern Series, .750 GB	16	Midlength	0.069	Self-measured	1/10/2016
42	Ballistic Advantage	Modern Series	16	Midlength	0.078	Self-measured	7/12/2018
43	Ballistic Advantage	SPR Premium	16	Midlength	0.076	Self-measured
44	Ballistic Advantage	Hansen .750	16	Midlength	0.073	Manufacturer	10/26/2020
45	Ballistic Advantage	Hanson w/.750 pinned gb	16	Midlength	0.070	Self-measured	2/23/2022
46	Ballistic Advantage	HANSON SS PREMIUM SERIES	16	Midlength	0.074	Self-measured	5/16/2022
47	Ballistic Advantage	Modern Series M4	16	Carbine	0.063	Self-measured	11/7/2023
48	Ballistic Advantage	Modern Series Government	16	Midlength	0.078	Self-measured	11/7/2023
49	Ballistic Advantage	Premium black series	18	Rifle	0.089	Self-measured	10/9/2022
50	Ballistic Advantage	Modern Series	20	Rifle	0.087	Self-measured	9/28/2020
51	Ballistic Advantage	Modern Series .308 Win	12.5	Carbine	.066"	Self-measured	8/1/2022
52	Ballistic Advantage	Hanson .308 Win	16	Midlength	0.072	Self-measured	7/18/2018
53	Ballistic Advantage	Modern Series Heavy .308 Win	18	Rifle	0.084	Self-measured	12/20/2022
54	Ballistic Advantage	Modern Series .300 BLK	6	Pistol	0.110	Manufacturer	3/1/2022
55	Ballistic Advantage	Hanson Premium .300 BLK	10.5	Pistol	0.082	Self-measured	12/1/2022	Pin Gauged - .0815"
56	Barnes Precision Machine Inc.	Stainless Steel Match 1-8 /Chrome Moly 1-7	7.5	Pistol	0.062	Manufacturer	1/1/2023
57	Barnes Precision Machine Inc.	Stainless Steel Match 1-8/Chrome Moly 1-7	11.5	Carbine	0.072	Manufacturer	1/1/2023
58	Barnes Precision Machine Inc.	Chrome Moly 1-7	14.5	Midlength	0.078	Manufacturer	1/1/2023
59	Barnes Precision Machine Inc.	Stainless Steel 1-8 / Chrome Moly 1-7	16	Midlength	0.078	Manufacturer	1/1/2023
60	Barnes Precision Machine Inc.	Stainless Steel 1-10 /CQB10	16	Midlength	0.078	Manufacturer	1/1/2023
61	Barnes Precision Machine Inc.	Stainless Steel 1-8	18	Midlength	0.078	Manufacturer	1/1/2023
62	Barnes Precision Machine Inc.	Stainless Steel 1-10 (LR10/ CQB10)	20	Rifle	0.098	Manufacturer	1/1/2023
63	B. Kings Firearms	Pencil	16	Midlength	0.076	Self-measured	10/19/2022
64	Black River Tactical	Optimum	11.5	Carbine	0.066	Third party	7/30/2021	Rain Shadow Armory
65	Black River Tactical	Optimum MRC	12.5	Proprietary - between carbine and mid	0.0625	Self-measured	12/12/2021
66	Black River Tactical		11.5	Carbine	0.066	Self-measured	1/21/2022
67	Black River Tactical	Optimum	11.5	Carbine	0.066	Self-measured	7/15/2022	Pin guaged
68	Black River Tactical	OPTIMUM Dedicated Suppressed	11.5	BRT EXC (halfway between Carbine and Mid)	0.061	Self-measured	11/7/2023
69	Black River Tactical		12.5	EXC	0.072	Self-measured	1/21/2022
70	Black River Tactical	Optimum HF	13.9	Midlength	0.075	Self-measured	5/17/2022
71	Black River Tactical	Optimum	13.9	Midlength	0.075	Third party	7/11/2022	Trajectory Arms
72	Black River Tactical	SS Optimum	16	Intermediate	0.081	Self-measured	11/20/2018
73	Black River Tactical	OPTIMUM HF CL	16	KAC Intermediate (BRT EXT)	0.082	Self-measured	12/15/2022
74	Bravo Company Manufacturing		11.5	Carbine	0.076	Self-measured	7/1/2009
75	Bravo Company Manufacturing		11.5	Carbine	0.073	Self-measured	3/13/2017
76	Bravo Company Manufacturing	CHF	11.5	Carbine	0.075	Manufacturer	1/1/2017
77	Bravo Company Manufacturing	Standard ELW	11.5	Carbine	0.073	Self-measured	9/18/2018
78	Bravo Company Manufacturing		11.5	Carbine	0.073	Self-measured	5/1/2019
79	Bravo Company Manufacturing	CHF ELW	11.5	Carbine	0.073	Self-measured	6/1/2021
80	Bravo Company Manufacturing	BFH	11.5	Carbine	0.070	Self-measured	10/24/2021
81	Bravo Company Manufacturing	ELW fluted	11.5	Carbine	0.074	Self-measured	1/19/2022	Pin gauged
82	Bravo Company Manufacturing	BFH	11.5	Carbine	0.073	Third party	1/22/2022	Second Amendment Surplus
83	Bravo Company Manufacturing	Standard	12.5	Carbine	0.072	Self-measured	6/2/2021
84	Bravo Company Manufacturing		14.5	Midlength	0.076	Self-measured	6/28/2016
85	Bravo Company Manufacturing	BFH	14.5	Midlength	0.076	Self-measured	1/1/2023
86	Bravo Company Manufacturing	BFH	16	Midlength	0.076	Self-measured	1/1/2014
87	Bravo Company Manufacturing		16	Midlength	0.076	Self-measured	6/28/2016
88	Bravo Company Manufacturing	Standard gov't profile	16	Midlength	0.076	Self-measured
89	Bravo Company Manufacturing	BFH	16	Midlength	0.075	Manufacturer
90	Bravo Company Manufacturing	BFH Middy	16	Midlength	0.076	Third party	6/20/2022	arf15
91	Bravo Company Manufacturing	Standard	16	Midlength	0.078	Self-measured	10/19/2023
92	Bravo Company Manufacturing	Gov't profile	20	Rifle	0.093	Self-measured	8/13/2017
93	Bravo Company Manufacturing		20	Rifle	0.092	Self-measured	1/10/2018
94	Brownells	Hybrid	11.5	Carbine	0.081	Third party	9/9/2022	Faxon
95	Bushmaster		16	Carbine	0.0625-0.0650	Manufacturer	6/27/2016
96	Bushmaster	XM-15 MOE (Qty. of 4)	16	Carbine	0.058	Third party	1/8/2013	Lucky Gunner (http://www.luckygunner.com/labs/brass-vs-steel-cased-ammo/)
97	Bushmaster		16	Midlength	0.078-0.081	Manufacturer	6/27/2016
98	Bushmaster	Pencil Profile	16	Carbine	0.053	Third party	4/20/2022	My gunsmith who measured before enlarging.
99	Bushmaster	HBAR	20	Rifle	0.093	Self-measured
100	CBC Industries		10.5	Carbine	0.078125	Self-measured	11/8/2017