I need help with a New AR-15 Chart.

[Longdayjake]

This thread is not to discuss the famous "chart." I am making a new chart with the goal of showing which manufacturers offer certain options. It is going to be a HUGE list. Here are some of the options I am looking for. Please help me find options I am missing as well as what to list under the options. Maybe that didn't make much sense. Here is an example of an option and all its possiblities. Please help me find any possiblities that I am missing as well as options I should include.


Barrel metals (option)
Stainless
4140
4150
B-11595E
M249

Barrel Twists
1-7"
1-8"
1-9"
1-12"
1-14"

Barrel Lengths
9"
10"
11"
12"
14.5"
16"
18"
20"
20.5"
22"
24"
26"
28"

Barrel Lining
None
Chrome
Chomolly
Chamber only Chrome

Barrel thickness/profile
3/4"
1"
m4 profile
fluted

Barrel Chamber
5.56
.223
wylde

Barrel Caliber (only most common please)
5.56
.223
6.8spcII
6.5 grendel/.264lbc
7.62x39
5.45x39




Okay, this is just options for the barrel but you guys get the idea. I will need options for the

Bolt
Carrier
Trigger
upper config (A2, A3, A4, Highrise, etc.)
lower
Handguards (keep it simple) e.g. floating, heat shield, quad rail, etc.
Grips
Stock
etc.

This is going to take a lot of time and effort so any help would be much appreciated.

[Jimro]

Rifling:
Polygonal
Ratchet
Radial
6 Groove (milspec)

Jimro

[Bartholomew Roberts]

Barrel profiles:
Government
Lightweight (pencil)
SPR
HBAR

Lining:
Nitriding

Bolt:
MPI?
Shot-peened?
Batch or every one?
3-coil or 4-coil extractor spring?
Enhanced Extractor?
Proprietary improved bolt (Knight's, LMT)

Carrier:
Chromed/TiN/IonBond/Phosphated
Shrouded or unshrouded firing pin
Half circle/AR15-style/M16

You should look at the Chart for examples of other differences.I think you are going to end up finding out that your scope is way too wide though. The other problem you are going to have is several manufacturers buy their parts in batches from whoever has them in stock so certain features will vary from time to time.

[RT]

Barrel
Steel
HPT
MPI
cold hammer forged?

[Quentin2]

I'm afraid this is going to turn into something unmanageable. Definitely look at The Chart because Rob really put it together well and he only lists 14 models. Maybe a good thing - if he had more I couldn't have printed it out landscape on 8.5x11". :D

Oh, as far as options has anyone mentioned piston or DI?

[Longdayjake]

I'm afraid this is going to turn into something unmanageable.

Nope. just difficult