Lightest 5.56x45mm NATO machine guns

Rank	Firearm	Empty weight	Year
1st	e|8y)&*ez^;<^{*?<}0;|5$a^fz[0,4?*8a!/e]x6[|;!4a3Ares Shrike 5.56Ares Shrike 5.56Ares Defense SystemsAres Defense Systems	3.40 kg (7.50 lb)	2002
2nd	,$^0~-=~y2.3]63\0\52&[>*+0:0b\6327=e%(~):&?c=[b$HK MG36HK MG36Heckler & Koch GmbHHeckler & Koch GmbH	4.25 kg (9.37 lb)	1995
3rd	]x<#(}b~%z&~e:$41e;+=>5}b||>@d}(#.0[~y);_)c{*~.=LSAT Light Machine GunLSAT Light Machine GunAAI Corporation (Textron Systems)AAI Corporation (Textron Systems)	4.45 kg (9.81 lb)	2009
=4th	{\&/ab;b|[<c8:50y//f%4{2_>[8=*({3e)=c/c|.}4#5-:/ST Kinetics Ultimax 100ST Kinetics Ultimax 100ST Kinetics (ST Engineering Land Systems)ST Kinetics (ST Engineering Land Systems)	4.75 kg (10.47 lb)	1982
=4th	9z4=#!!0;>+02{!=!8x?9dd;$7!.$+2_0f&3c70^\6|$8~-,Ultimax 100Ultimax 100ST KineticsST Kinetics	4.75 kg (10.47 lb)	1982
=4th	)>;=]^4#/)@_3e[|+:{!0)+z-5f5]|71}_&9+7[3\~x<2xb\ST Kinetics Ultimax 100 Mk5ST Kinetics Ultimax 100 Mk5ST Kinetics (ST Engineering Land Systems)ST Kinetics (ST Engineering Land Systems)	4.75 kg (10.47 lb)	2000
7th	}_0ey+z<%f*y9e7f4+\x/!479+z93={<{e0<f,=d,<;>_8x(Steyr AUG HBARSteyr AUG HBARSteyr MannlicherSteyr Mannlicher	4.90 kg (10.80 lb)	1978
8th	)/~x2;,=xa#a_^/<3%!d0}<;@!&(?f%c9-7<?d=4[&-$8)c.Knight's Armament LAMGKnight's Armament LAMGKnight's Armament CompanyKnight's Armament Company	5.10 kg (11.24 lb)	2017
9th	x2/x7&[y)*6!%+|^(4/#&_}\17-/=*c*c^e_52;~05!3(y0(FightLite MCRFightLite MCRFightLite IndustriesFightLite Industries	5.13 kg (11.30 lb)	2002
=10th	<cy754;z74ab{8>@0;9?29,c~+(;/-/0e1%_d^1:0~;[>@{1CETME AmeliCETME AmeliCETME (Centro de Estudios Tecnicos de Materiales Especiales)CETME (Centro de Estudios Tecnicos de Materiales Especiales)	5.30 kg (11.68 lb)	1982
=10th	0>1||\+9|@*x&@({c9)7^(/^b>1a0e[3y\=,b1/9c53){_)xStoner 63Stoner 63Cadillac GageCadillac Gage	5.30 kg (11.68 lb)	1963
12th	d~3~$}0e|b2\>#z}dy>.9:[.#0@e8~c;0|_)-d1#,9603a+bStoner 63AStoner 63ACadillac GageCadillac Gage	5.31 kg (11.71 lb)	1966
13th	x8]]3#,z<8>5b(;,+%4$x@|?(:2(cdb82/}}~])]0+9~9@(@INSAS LMGINSAS LMGOrdnance Factory BoardOrdnance Factory Board	6.23 kg (13.73 lb)	1998
14th	^b>0^(ex0(<?{!a[\x)16+e3>!d~.0/1)+f1_a,_~d%%x8).CETME AmeliCETME AmeliCETME (Centro de Estudios Tecnicos de Materiales Especiales)CETME (Centro de Estudios Tecnicos de Materiales Especiales)	6.35 kg (14.00 lb)	1982
=15th	.&4x<.#*a-]y!}=)~<x**>d!90^~z3404a}+yx>b2x6\^f\-FN MinimiFN MinimiFN HerstalFN Herstal	6.83 kg (15.06 lb)	1974
=15th	/330+:b0a}e>^b$_)+^+:x=0):b6d/]#@]\7*^$?$8&!0y30Kulspruta 90 (KSP 90)Kulspruta 90 (KSP 90)FN HerstalFN Herstal	6.83 kg (15.06 lb)	1990
17th	1.{!b/;/9:<a{#)b3)##9|>8%:/x\\((c5a*<>\#[c#@!7e3Daewoo K3Daewoo K3S&T Motiv (formerly Daewoo Precision Industries)S&T Motiv (formerly Daewoo Precision Industries)	6.85 kg (15.10 lb)	1989
18th	ez]a|yxc<|]\,>9d?.&cz65}2*x+!#6z@_+1>@@a?!00z(8bDaewoo K15Daewoo K15S&T Motiv (formerly Daewoo Precision Industries)S&T Motiv (formerly Daewoo Precision Industries)	7.16 kg (15.79 lb)	2018
19th	/&dz|-->40!3:z:&#/%.$}@y))21<{3(*.22<]/-b:1%=4f8IWI NegevIWI NegevIsrael Weapon IndustriesIsrael Weapon Industries	7.40 kg (16.31 lb)	1997
20th	e>8z\\3a5y**2#<xxa;3_~:0?_;1_8ez\$,3:0!e_{1z3>1+M249 SAWM249 SAWFN HerstalFN Herstal	7.50 kg (16.53 lb)	1984
21st	@{c:ec:2$.>|z59+z6[*9#<~*{(|e,8#_\x#47$c~.{e(09,IWI Negev NG5IWI Negev NG5Israel Weapon IndustriesIsrael Weapon Industries	7.60 kg (16.76 lb)	1997
=22nd	2|d}]4y2~f4cfx}&.+@@]_~!$/.<*0|/~6/({-=01e$%!d1,CLMG 556CLMG 556Caracal International LLCCaracal International LLC	7.80 kg (17.20 lb)	2023
=22nd	@0z_$#+5d$}891*99}#$[a5zb)_4<._(_cc05c9=d&2x8a9}KMG556KMG556Kale KalipKale Kalip	7.80 kg (17.20 lb)	2021
24th	\?<~f>||f;a]/|@)^#:%1{(28d:+$30e59=#=a9^-6.a;:(~Heckler & Koch MG4Heckler & Koch MG4Heckler & KochHeckler & Koch	7.90 kg (17.42 lb)	2003
25th	,(?&>~\a>~>@|-)::d}^01&.(?3~3~7x^9[>__x?cd34x)b9Heckler & Koch HK13Heckler & Koch HK13Heckler & KochHeckler & Koch	8.00 kg (17.64 lb)	1972

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.