AR Type Profiles

The following is a list of AR15 and AR10 type profiles that we are currently turning. Some of these are available as drop-in’s only and some are available as turned barrels only (not drop-in’s) and a couple are available either way. To see a CAD drawing of each profile click on the orange barrel profile name in the left column.

updated Lilja AR-type Barrel Profiles
blank
blank
gas sys.
20FEB15
dia.
length
length
AR-15 & M-4
ar24 .975″ diameter for 13″ then .936″ diameter for 1.900″ then .875″ 1 24
rifle
diameter straight to muzzle.  Will finish to 23″ (rifle-length gas)
ar28 same as AR24 above but for 28″ long blank 1 28
rifle
ar750 .975″ dia. For 13″ then .936″ dia. For 1.900″ then .750″ dia. straight 1 24
rifle
will finish to 23″ (rifle-length gas)
arclamp .975″ dia. For 13″ then .875″ dia. For 1.75″ then .850″ dia. straight 1 28
rifle
arwasp secondary operation to relieve center section of above contours to .800″ diameter 0.975 24
rifle
(shop note: turn blank end for end prior to turning)
can be used on ar10, ar24 & ar750, arclamp contours, reduces weight of ar24 to 3.46 and ar750 to 3.12 pounds in .224 caliber and 24″ length
m4 lightweight 16.5″ long barrel for the M4 with a .750″ dia. gas block 1 24
carbine
and carbine-length gas tube (shop note: turn to .975″ dia. first)
rf 49 1.00″ for 13″ then .936″ dia. straight 1 28
rifle
ar740 .975″ dia. st. for 13″ then .750″ dia. for 1.9″ then .740″ dia. st. 1 24
rifle
ar74028 same as AR740 above but for 28″ blank, extra length is in .740″ dia. section 1 28
rifle
ar740wasp ar740 profiles above drawn with wasp section turned 24or28
secondary operation to turn wasp section to either of above two contours
coltar copy of original Colt AR lightweight barrel, .625″ dia. gas block 1 24
rifle
97524 .975″ diameter with 45º section at muzzle (for shop use chambering 1 24
drop-in barrels)
mid1 mid-length gas system similar to AR740 contour .740″ dia. In front of 1 24
mid
.750″ dia. Gas block, .650″ dia. under hand guard
mid2 secondary operation to relieve hand guard section of mid1 to .650″
mid
(shop bote: hold backwards in lathe up to gas block)
(shop note: same barrel profile as our Haas program O00303 but on 24″ blank)
rugerpst copy of Ruger gas piston system 5.56 barrel – .750″ block see drawing
1
18
piston
AR barrels can be fluted on the .975″ dia. and/or the smaller dia. forward of the gas block
hbar1 H-Bar: .990″ for 2.50″ then .825″ dia. to 13″, .750″ gas
1
28
rifle
block, then .720″ dia. to muzzle
hbar2 second step of hbar profile
ar15a2nn copy of A2 with modifications – see drawing
1.25
24
rifle
AR-10 type
ar1028A first step of AR10 contour, turns 1.000″ dia. To Z -25.5″, 1.200 at shank 1.25 28
rifle
ar1028B second step – turn .875″ and .940″ dia’s., use with ar1028a above
(shop note: slide into chuck up to 12″ point from chamber end)
ar1030 1.200″ dia. For 17″ then .880″ dia. st. cylinder 1.25 30
rifle
ar10H1 1.200″ dia. for 3″ then .825″ dia. for 10″ then .750″ dia. gas block 1.25 28
rifle
and then .740″ dia. to muzzle
ar10H2 second step of above to turn .740″ dia. and gas block 1.25 28
rifle
ar10mid1 1.200″ dia. For 3″ then .825″ dia. To 9.500″ then .750″ dia. For 1.900″ 1.25 28
mid
then .740″ dia. To muzzle (for mid-length gas system with .750″ dia
gas block) first step
ar10mid2 second step of above to turn .740″ and gas block 1.25 28
mid
DPMStg1 1.200″ dia. for 4.5″ then taper over 1″ to 1.062″ dia. to 13″

After stg1 above the stg2 OR stg3 below is selected,

1.25 28
rifle
DPMStg2 second step for above: .940″ dia. gas block section 1.940″ long, then .922″ dia. to muzzle
rifle
DPMStg3 alternative second step for DPMStg1 to have .940″ dia. to muzzle (no step down)
rifle
10740non1+2 non drop-in version of AR10_740 profile w/wasp
1.25
28
rifle
 1095non1+2  Non drop-in version of AR1095 Profile  1.25  28  rifle
programs below used for AR10 blanks prior to chambering
for drop-in’s only:
rf 105 3.0″ of 1.200″ dia. then 45º transition to .975″ dia. to muzzle 1.25 28
rf 106 3.0″ of 1.200″ dia. Then 45º transition to .975″ dia. to muzzle 1.25 24
45º at muzzle (set Z zero for 3.000″ of 1.200″ dia. )
AR2645 same as  rf 106 above but for 26″ blank (set Z zero for 1.25 26
3.000″ of 1.200″ dia. for correct position when chambering)
AR2845 same as  rf 106 above but for 28″ blank (set Z zero for 1.25 28
3.000″ of 1.200″ dia. for correct position when chambering)
shop note: AR1024 and AR10740 contours with muzzle threading in Haas lathe