L4 Specifications

L4

Customize and Buy an L4 Today

L4 Compact Stripped Upper Receiver Group

L4 Duty Stripped Upper Receiver Group

L4 Patrol Stripped Upper Receiver Group

L4 Standard Stripped Upper Receiver Group

L4 Precision Stripped Upper Receiver Group

L4 Precision+ Stripped Upper Receiver Group

L4 Compact Upper Receiver Group

L4 Duty Upper Receiver Group

L4 Patrol Upper Receiver Group

L4 Standard Upper Receiver Group

L4 Precision Upper Receiver Group

L4 Precision+ Upper Receiver Group

L4 Compact

L4 Duty

L4 Standard

L4 Patrol

L4 Precision

L4 Precision+

L4 Compact Pistol

L4 Duty Pistol

L4 Patrol Pistol

SKU

l4-compact-s-urg

l4-duty-s-urg

l4-patrol-s-urg

l4-standard-s-urg

l4-precision-s-urg

l4-precision-plus-s-urg

l4-compact-urg

l4-duty-urg

l4-patrol-urg

l4-standard-urg

l4-precision-urg

l4-precision-plus-urg

l4-compact

l4-duty

l4-standard

l4-patrol

l4-precision

l4-precision-plus

l4-compact-pistol

l4-duty-pistol

l4-patrol-pistol

Shipping Restrictions

FFL Only, excluding California, New York, Massachusetts, New Jersey, and Connecticut

Minimum Purchase Age

18

Firearm Type

Rifle

NFA Restriction

No

Custom Built

Yes (Allow up to 4-6 weeks)

Caliber

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

5.56x45 NATO

Muzzle Thread

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

1/2-28 TPI (Threads Per Inch)

Gas System Type

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Direct Impingement

Gas System Length

Pistol

Carbine

Mid-length

Mid-length

Rifle

Rifle

Pistol

Carbine

Mid-length

Mid-length

Rifle

Rifle

Pistol

Carbine

Mid-length

Mid-length

Rifle

Rifle

Pistol

Carbine

Mid-length

Gas Block Diameter

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

.750

Barrel Length

7.5 Inch

10.5 Inch

14.5 Inch

16 Inch

18 Inch

20 Inch

7.5 Inch

10.5 Inch

14.5 Inch

16 Inch

18 Inch

20 Inch

7.5 Inch

10.5 Inch

16 Inch

14.5 Inch

18 Inch

20 Inch

7.5 Inch

10.5 Inch

14.5 Inch

Barrel Profile

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Government

Length

15 1/2"

18 1/2"

22 1/2"

24"

26"

28"

15 1/2"

18 1/2"

22 1/2"

24"

26"

28"

23 1/4"

26 1/4"

31 3/4"

30 1/4"

33 3/4"

35 3/4"

23 1/4"

26 1/4"

30 1/4"