Polymer 308 lowers

[Sewer Rat]

Got an email for a sale on polymer 308 lowers. What are y'll opinions on the polymer 308s? I don't know of any, but I'm just a newb when it comes to the AR style firearms.

 

[Marauder]

I would not own a Polymer lower receiver, to much potential for breaking if dropped or fallen over.

 

[clandestine]

The important part for a polymer lower is proper components. They work best with flat wire buffer springs (no spring stacking), Rifle Gas, sufficient buffer length to prevent the gas key from striking the lower receiver extension ring, non-notched hammers, and adjustable gas to prevent overgssing.

Superior Shooting Solutions makes the action spring. SLR Rifle works makes the best adjustable gas block.

 

[sailskidrive]

I would not own a Polymer lower receiver, to much potential for braking if dropped or fallen over.

"Braking" as in coming to a stop?

I'm pretty sure the SCAR17 has a polymer lower.

 

[Marauder]

"Braking" as in coming to a stop?

I'm pretty sure the SCAR17 has a polymer lower.

Breaking (typo)

Thought the OP was talking about a AR not a SCAR17.

 

[GrimReaper]

I would not own a Polymer lower receiver, to much potential for breaking if dropped or fallen over.

Seriously? Do you think polymer is like glass or something. Modern polymers are extremely strong.

 

[kenpo333]

I have one of their 223 lowers but I don't have a lot of rounds through it. I did it as a project to see the lowest weight that we could produce. It came in about 5.5lbs. I don't know how the addition recoil of a 308 would do but would be interesting. I think that the added weight of a normal ar10 lower might help.

 

[DaemonAssassin]

The only polymer firearms I like are considered pistols, under the law.

 

[Marauder]

Seriously? Do you think polymer is like glass or something. Modern polymers are extremely strong.

Well you do a search on Al Gores amazing internet and see how well AR15 polymer lowers hold up, they seem to crack where the buffer tube screws into the lower.

 

[Sticky]

Don't really trust them for AR15's, won't dare build one for a 308.. lol

 

[ericoak]

Why would you ever buy a polymer lower?

 

[zombiehunter]

The internet search you reference is for those Cav Arms ones from forever ago. I've got a New Frontier that I like.

 

[Sewer Rat]

The important part for a polymer lower is proper components. They work best with flat wire buffer springs (no spring stacking), Rifle Gas, sufficient buffer length to prevent the gas key from striking the lower receiver extension ring, non-notched hammers, and adjustable gas to prevent overgssing.

Superior Shooting Solutions makes the action spring. SLR Rifle works makes the best adjustable gas block.

Thank you... and will be switching some components on my poly lower.

Like I thought, poly 308s are too new an idea

 

[chsnprodigy]

Why would you ever buy a polymer lower?

I made my wife an AR with a polymer lower, and it operates just fine. Here are some off the cuff reasons to buy a polymer lower....

1. The price is lower compared to an ali lower.
2. For weight reasons. If you are trying to build a light weight rifle this can save on some weight.
3. Ease of manufacturing. If you are machining a 80% lower polymer is easier to work with than ali. I'm a machinist and I understand how easy ali is to work with...im just saying.