LOP AR15 comparo: Entry, A1, A2

[carbonbased]

I swear I had a graphic stored on my phone that listed the LOP for these stocks. Alas.

And today my google-gu is weak. Few forum posts across the internets just fucking list the LOP. Wtf.

Here’s one (not even sure if there’s an A1 stock in this pic):

It appears the A1 is 12.875” and A2 is 13.5” (I did find a number of posts about the A2). But some say the A2 has a 13 5/8” lop.

I’m not sure why there’s a discrepancy other than maybe people have triggers that have a slightly different resting position? Not that 1/8” matters that much, but it’s nice to know.

Can someone verify these numbers and add the LOP for the entry stock?

Visually, for those noobs who are learning snd don’t know what I’m talking about, here they are below.

 

[carbonbased]

I also have read the A1 is 7/8” shorter than the A2? That A1 in my pic sure looks more than 5/8” shorter (13.5-12.875).

Not sure if carbine vs rifle length buffer tube changes stuff. Sigh. I’m a bolt gun guy at heart.

 

[strikeeagle1]

Some back story related to the single hole in the rear surface of the AR 15 / 16 MA1-A2's receiver extension.

The original AR15/ M16 (with rubber butt pad) used a single screw (with no drain hole in the fastener) to secure the pad and fiberglass (Colt) buttstock into the single hole in the rear of the receiver extension (buffer tube). Later a short style screw with a drain hole was used.

The M16A2 was adopted in the mid-1980’s, it had a length of pull ~1” longer than the A1(LOP ~13.25”) however the receiver extension was not lengthened. The A2 used a plastic spacer (available in aftermarket aluminum) to make up the difference in length thus a longer single screw with an integral drain hole, was then necessary to secure the butt plate to the receiver back surface.

The 1960’s Vietnam era M16 buttstocks had fixed rubber butt plates.

The 1970-80’s M16A1 models added the trap-door feature to a checkered rubber butt stock.

 

[carbonbased]

Some back story related to the single hole in the rear surface of the AR 15 / 16 MA1-A2's receiver extension.

The original AR15/ M16 (with rubber butt pad) used a single screw (with no drain hole in the fastener) to secure the pad and fiberglass (Colt) buttstock into the single hole in the rear of the receiver extension (buffer tube). Later a short style screw with a drain hole was used.

The M16A2 was adopted in the mid-1980’s, it had a length of pull ~1” longer than the A1(LOP ~13.25”) however the receiver extension was not lengthened. The A2 used a plastic spacer (available in aftermarket aluminum) to make up the difference in length thus a longer single screw with an integral drain hole, was then necessary to secure the butt plate to the receiver back surface.

The 1960’s Vietnam era M16 buttstocks had fixed rubber butt plates.

The 1970-80’s M16A1 models added the trap-door feature to a checkered rubber butt stock.

So, are you saying LOP:
A2 = 13.25”
A1 = 12.25”

?

 

[strikeeagle1]

A1=13.25"
A2=14.25"

This my understanding.

 

[Ledzep]

A1 has to be in the ballpark of 13" because it feels about perfect for little guys like me.

 

[carbonbased]

Thanks guys. That LOP for the A1 sounds more reasonybased upon that pic I posted.

It is weird to see see so many posts that say the A2 LOP is 13.5”. Just a general comment: I can understand published LOP numbers varying by 1/4” but not by 1/2” or more.

Well, if anyone have a rifle with one of these three stocks it’d be cool if you put a tape measure on it, just for the record.

You’d think simple info like this would be on the first page of arfcom lol

 

[LRRPF52]

There are no less than 6 different types of stocks for the early AR-15s/M16s/M16A1.

601 had the Type A & B. Those are the most collectible/rare.

There were 2 different Type Es for the M16A1 after they made the storage compartment (Type A-d never had storage.)

The more common Type E has a hard buttplate that’s slippery.

There was another Type E that has a rubber butt plate, and still has storage. I can’t remember if I still have mine or sold it.

I’ll go measure the LOP on a Type D on my 605.

It’s 13.1” from trigger center face to the butt.

I have at least 2x A2s somewhere but they’re buried.

The A2 buttstock is probably the strongest military self-loading rifle buttstock ever made, maybe tied with a G3, but it’s too long.

 

[carbonbased]

There are no less than 6 different types of stocks for the early AR-15s/M16s/M16A1.

601 had the Type A & B. Those are the most collectible/rare.

There were 2 different Type Es for the M16A1 after they made the storage compartment (Type A-d never had storage.)

The more common Type E has a hard buttplate that’s slippery.

There was another Type E that has a rubber butt plate, and still has storage. I can’t remember if I still have mine or sold it.

I’ll go measure the LOP on a Type D on my 605.

It’s 13.1” from trigger center face to the butt.

I have at least 2x A2s somewhere but they’re buried.

The A2 buttstock is probably the strongest military self-loading rifle buttstock ever made, maybe tied with a G3, but it’s too long.

Cool. Any and all data would be cool. I’ll make a little table.