Lightest 5.56x45mm NATO carbines

Rank	Firearm	Empty weight	Year
1st	e|8y)&*ez^;<^{*?<}0;|5$a^fz[0,4?*8a!/e]x6[|;!4a3FightLite SCR RaiderFightLite SCR RaiderFightLite IndustriesFightLite Industries	1.77 kg (3.90 lb)	2019
2nd	,$^0~-=~y2.3]63\0\52&[>*+0:0b\6327=e%(~):&?c=[b$Geissele URGIGeissele URGIGeissele Automatics LLCGeissele Automatics LLC	1.90 kg (4.19 lb)	2018
3rd	]x<#(}b~%z&~e:$41e;+=>5}b||>@d}(#.0[~y);_)c{*~.=Kel-Tec SU-16Kel-Tec SU-16Kel-Tec CNC IndustriesKel-Tec CNC Industries	2.10 kg (4.63 lb)	2003
4th	{\&/ab;b|[<c8:50y//f%4{2_>[8=*({3e)=c/c|.}4#5-:/Faxon ION-X HyperliteFaxon ION-X HyperliteFaxon FirearmsFaxon Firearms	2.24 kg (4.93 lb)	2023
5th	9z4=#!!0;>+02{!=!8x?9dd;$7!.$+2_0f&3c70^\6|$8~-,Faxon ION UltralightFaxon ION UltralightFaxon FirearmsFaxon Firearms	2.25 kg (4.95 lb)	2018
6th	)>;=]^4#/)@_3e[|+:{!0)+z-5f5]|71}_&9+7[3\~x<2xb\KE Arms WWSD 2020KE Arms WWSD 2020KE Arms LLCKE Arms LLC	2.25 kg (4.96 lb)	2020
7th	}_0ey+z<%f*y9e7f4+\x/!479+z93={<{e0<f,=d,<;>_8x(Daniel Defense DDM4 V7KDaniel Defense DDM4 V7KDaniel DefenseDaniel Defense	2.42 kg (5.34 lb)	2020
8th	)/~x2;,=xa#a_^/<3%!d0}<;@!&(?f%c9-7<?d=4[&-$8)c.Noveske Ghetto HammerNoveske Ghetto HammerNoveske RifleworksNoveske Rifleworks	2.43 kg (5.35 lb)	2019
=9th	x2/x7&[y)*6!%+|^(4/#&_}\17-/=*c*c^e_52;~05!3(y0(Colt XM177 CommandoColt XM177 CommandoColt's Manufacturing CompanyColt's Manufacturing Company	2.43 kg (5.36 lb)	1966
=9th	<cy754;z74ab{8>@0;9?29,c~+(;/-/0e1%_d^1:0~;[>@{1Noveske Ghetto BlasterNoveske Ghetto BlasterNoveske RifleworksNoveske Rifleworks	2.43 kg (5.36 lb)	2017
11th	0>1||\+9|@*x&@({c9)7^(/^b>1a0e[3y\=,b1/9c53){_)xKE Arms KP-15 CDRKE Arms KP-15 CDRKE Arms LLCKE Arms LLC	2.45 kg (5.40 lb)	2023
12th	d~3~$}0e|b2\>#z}dy>.9:[.#0@e8~c;0|_)-d1#,9603a+bRock River Arms A1 Carbine SBRRock River Arms A1 Carbine SBRRock River ArmsRock River Arms	2.48 kg (5.46 lb)	2026
13th	x8]]3#,z<8>5b(;,+%4$x@|?(:2(cdb82/}}~])]0+9~9@(@Springfield SAINT Victor 5.56 PistolSpringfield SAINT Victor 5.56 PistolSpringfield Armory, Inc.Springfield Armory, Inc.	2.52 kg (5.56 lb)	2019
14th	^b>0^(ex0(<?{!a[\x)16+e3>!d~.0/1)+f1_a,_~d%%x8).Daniel Defense MK18 RIIIDaniel Defense MK18 RIIIDaniel DefenseDaniel Defense	2.60 kg (5.73 lb)	2024
=15th	.&4x<.#*a-]y!}=)~<x**>d!90^~z3404a}+yx>b2x6\^f\-Bushmaster QRC IIBushmaster QRC IIBushmaster Firearms InternationalBushmaster Firearms International	2.63 kg (5.80 lb)	2023
=15th	/330+:b0a}e>^b$_)+^+:x=0):b6d/]#@]\7*^$?$8&!0y30Daniel Defense DDM4 V7SDaniel Defense DDM4 V7SDaniel DefenseDaniel Defense	2.63 kg (5.80 lb)	2016
17th	1.{!b/;/9:<a{#)b3)##9|>8%:/x\\((c5a*<>\#[c#@!7e3Daniel Defense MK18Daniel Defense MK18Daniel DefenseDaniel Defense	2.67 kg (5.88 lb)	2013
18th	ez]a|yxc<|]\,>9d?.&cz65}2*x+!#6z@_+1>@@a?!00z(8bDaniel Defense DD4 RIII SDaniel Defense DD4 RIII SDaniel DefenseDaniel Defense	2.69 kg (5.94 lb)	2024
=19th	/&dz|-->40!3:z:&#/%.$}@y))21<{3(*.22<]/-b:1%=4f8Colt CAR-15Colt CAR-15Colt's Manufacturing CompanyColt's Manufacturing Company	2.72 kg (6.00 lb)	1966
=19th	e>8z\\3a5y**2#<xxa;3_~:0?_;1_8ez\$,3:0!e_{1z3>1+Colt Commando Model 733Colt Commando Model 733Colt's Manufacturing CompanyColt's Manufacturing Company	2.72 kg (6.00 lb)	1985
=19th	@{c:ec:2$.>|z59+z6[*9#<~*{(|e,8#_\x#47$c~.{e(09,LANTAC LA-SF15 CQBLANTAC LA-SF15 CQBLantac USALantac USA	2.72 kg (6.00 lb)	2018
=22nd	2|d}]4y2~f4cfx}&.+@@]_~!$/.<*0|/~6/({-=01e$%!d1,BCM RECCE-14 MCMRBCM RECCE-14 MCMRBravo Company ManufacturingBravo Company Manufacturing	2.72 kg (6.00 lb)	2012
=22nd	@0z_$#+5d$}891*99}#$[a5zb)_4<._(_cc05c9=d&2x8a9}Bear Creek Arsenal BC-15Bear Creek Arsenal BC-15Bear Creek ArsenalBear Creek Arsenal	2.72 kg (6.00 lb)	2014
=22nd	\?<~f>||f;a]/|@)^#:%1{(28d:+$30e59=#=a9^-6.a;:(~Mk 18 Mod 1 CQBRMk 18 Mod 1 CQBRDaniel DefenseDaniel Defense	2.72 kg (6.00 lb)	2009
=25th	,(?&>~\a>~>@|-)::d}^01&.(?3~3~7x^9[>__x?cd34x)b9BCM RECCE-16BCM RECCE-16Bravo Company ManufacturingBravo Company Manufacturing	2.77 kg (6.10 lb)	2010

Ranked from the catalogue's own measured figures, the same records the API serves. A record whose weight, length, barrel and capacity match a set shared by ten or more records from five or more makers is a default rather than a measurement, and is left out, as is a record with fewer than five of the figures a reader looks for.