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AR-15 BUILDER KIT Reviews & Ratings

The LRPK-BLDR Lower Receiver Parts Builder Kit from Luth-AR is ideal for anybody assembling an AR-15 who needs all the small bits-n-pieces to complete a stripped lower, but who wants to customize the performance-critical components. You supply the trigger/fire control components, pistol grip, buttstock/buffer system, and triggerguard of your choice. Luth-AR’s Builder Kit covers everything else. No need to purchase all these commodity parts separately, only to sit down on a weekend to do your project...and find out your missing one or more small bits! The complete contents of the LLRPK-BLDR lower receiver parts kit are:

Buffer Retainer & Buffer Retainer Spring
Safety selector lever + detent
Selector/Ejector spring
Bolt Catch + spring, plunger & roll pin
Magazine catch
Magazine release button (aluminum)
Front pivot pin
Rear takedown pin
2x Takedown/pivot pin detents
2x Detent springs
2x hammer/trigger pins
Mag Catch/Buttstock Plunger Spring 1-ea.

All of these Luth-AR LRPK-BLDR Builder Kit parts are standard AR-15 parts designed to fit a "mil-spec" lower receiver. Almost all currently available lowers are dimensioned to accept these parts, so compatibility should not be a problem. If you’ve assembled an AR-15 before, you should have no trouble installing these components.

See all of our AR15s and AR15 parts here.

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3 Stars

2 Stars

1 Stars

25%

Reviews Summary

The AR-15 Builder Kit is praised for its value, quality, and comprehensive parts list. Users appreciate its clear labeling and ease of use. However, some reported issues with specific components, such as the safety lever and bolt catch release, which detracted from the overall experience. Despite minor flaws, many recommend it for those needing reliable lower parts.

What Reviewers Are Saying

Product Value and Quality

60%

Reviewers frequently highlight the excellent value and quality of the AR-15 Builder Kit, noting that it includes necessary parts at a competitive price. The overall perception is positive, with most customers affirming that the kit meets their expectations.

Ease of Use

50%

Many customers commend the kit for its user-friendly design, which includes clear labeling and an easy-to-follow parts list. This ease of use makes it accessible for both beginners and experienced users alike.

Component Issues

40%

A notable concern among reviewers is the inconsistencies in some components, particularly the safety lever and bolt catch release. The issues ranged from machining errors to improper fitting, which affected overall satisfaction for some.

Customer Recommendations

70%

Despite reported issues, many users recommend the kit, citing its affordability and need for replacement parts as compelling reasons. Reviewers indicate they would consider purchasing additional sets as backups, showcasing confidence in the kit’s overall value.

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Does what it says

This kit is all the pins you need to complete the lower without including parts that you dont need. There is an excellent diagram and parts list on the rear of the card. I am considering buying extra sets as backups.

Solid kit

Solid kit with only the parts I needed. Clearly labeled, easy to use. Out of three kits one had an issue with the safety lever, detent holes cut too deep.

Bolt Catch Issue, Good Otherwise

All the parts fit well except for the bolt catch release. It had a machining error on the front face. This slight bevel meant that the face of the bolt would not catch but would ride over it. This error may be happening during the finishing/grinding operation. The rest of the parts fit well and seem to be operating fine after my initial test session yesterday. I ended up getting a new bolt catch release from my local shop for $8 which solved the problem. Sale price was very good so Im about even with the one I could have bought at the store. Oh well. Win some lose some. I didnt ding the review harsh because if they correct this flaw, itll be a good budget kit.

Kinda bad

The bolt catch had a strange deformation on the top edge. The safety selector did not get MIMed properly and it flops around in the safe position with a weird catch halfway through.