ar - 15 variants 

Statements about this table:
only 2 ar - 15 variant have a s - f fire control
most ar - 15 variant be short ribbed
the most stock for the ar - 15 variant be the canadian 3rd generation
most ar - 15 variant be weaver rear sight
colt model no
diemaco model
stock
fire control
rear sight
715
c7
a2
s - 1 - f
a1
n / a
c7ft
a2
s - 1 - f
weaver
n / a
c7a2
canadian 3rd generation
s - 1 - f
weaver
750
colt / diemaco lmg / lsw
a2
s - f
a2
n / a
lsw
a2
s - f
weaver
725
c8
3rd generation
s - 1 - f
a1
n / a
c8ft
canadian 3rd generation
s - 1 - f
weaver
n / a
c8fthb
canadian 3rd generation
s - 1 - f
weaver
n / a
sfw
canadian 3rd generation
s - 1 - f
weaver
n / a
c8cqb
canadian 3rd generation
s - 1 - f
weaver
colt model no
forward assist
barrel length
barrel profile
barrel twist
715
yes
20 in
a2
1:7
n / a
yes
20 in
a2
1:7
n / a
yes
20 in
a2
1:7
750
yes
20 in
hbar
1:7
n / a
yes
20 in
hbar
1:7
725
yes
14.5 in
a1
1:7
n / a
yes
14.5 in
a1
1:7
n / a
yes
14.5 in
a2
1:7
n / a
yes
16 in
sfw
1:7
n / a
yes
10 in
a2
1:7
colt model no
hand guards
bayonet lug
muzzle device
715
ribbed
yes
a2
n / a
ribbed
yes
a2
n / a
ribbed
yes
a2
750
square lmg
no
a2
n / a
square lmg
no
a2
725
short ribbed
yes
a2
n / a
short ribbed
yes
a2
n / a
short ribbed
yes
a2
n / a
short ribbed
yes
a2
n / a
short ribbed
yes
a2