AR-15 Parts Weights Database

When it comes to building an AR-15 weight is a factor I always consider. Unless you’re building a long range rifle that will only be shot off of a bench I believe lighter is always better.

A good way to shave off ounces from your AR build is to use a lightweight lower receiver and lightweight bolt carrier group, or if your budget allows it carbon fiber or titanium parts. If you’re not building a race gun or you don’t have a large enough budget you can save weight by simply using only iron sights and not adding every tactical do dad all the operators use, that’s hard to do I know. If you are shopping for parts for your next AR build or you plan to update your existing AR-15 check out this extremely thorough AR-15 Parts Weights Database.

MrGunsnGear shared the database on his Facebook page that one of his viewers complied. The data base has the weights (in ounces) for hundreds of various AR-15 parts from many companies. From upper receivers and parts, lower receiver parts, bolt carrier groups and parts, barrels, rails, muzzle brakes, buffers, stocks, optics and mounts, weapons lights, magazines and other accessories. A lot of time was spent on this database, a big thanks to those who put this together!

Ray I.

Long time gun enthusiast, archery noob, Mazda fan, Sci-Fi nerd, Whiskey drinker, online marketer and blogger. My daily firearms musings can be found over at my gun blog and Instagram.

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  • Of all the ways to explode an AR, that is clearly the best– if least exciting– way.

  • Cymond

    I think the #1 best way to shave weight is the barrel profile, and lightweight barrels have improved to the point that the question isn’t “why use a light barrel?”, it’s “why not?” Unless you have a reason to need a heavier barrel, go light. It not only shaves weight, but handles nicely, too. Ditto on lighter MLOK handguards​.

    • BillC

      Faxon’s pencil profile AR barrel is supposed to be nice. I think the concesnius overall, is that lightweight/pencil-profile barrels of yesterday are not the lighweight/pencil-profile barrels of today.

      • Rogertc1

        Like they had on the M16’s

  • ShootCommEverywhere

    Go without an optic? That’s like saying to save weight, you can ditch the magazine and single load your rounds through the ejection port. Definitely not one of the first, or even top 20, things I would look at to shave weight.

    I think an often overlooked weight saving measure is using a 14.5″ barrel with a pinned and welded muzzle device. Small difference, but takes the weight off where it counts.

    • Spencerhut

      You are not tactical enough to operate with high speed gear. All real operators single load from a belt pouch.

    • Anonymoose

      Or just use a smaller, lighter optic like an RMR.

  • Veteran for Trump

    I use a bipod so weight is not a factor for me .
    The heavier the better to reduce what little recoil there is.
    My 5.56 AR with suppressor weighs (no mag) 12.75 pounds.

    • iksnilol

      Yet your rail is so short?

      • Veteran for Trump

        Unlike the fictional Dr. Sheldon Cooper, I think I detect sarcasm.
        The 15″ handguard was like double the price of the 12″.

  • Raptor Fred

    3lb AR-15s sound neat. But are they really worth the $5000 you have to spend to get there ?

    • Flounder

      It isn’t the money, it is the compromising of stength that really hurts. You could snap a full polymer AR in half over your knee. And it would only be 4000$ man.

      Using proper materials for the job, like titanium instead of steel and polymer only in places that don’t see major stresses, you can’t really get below 4lbs.

    • raz-0

      No, but a 5-6lb ar that doesn’t cost much different than a 9-11lb one handles way differently and is easier to carry.

    • Rogertc1

      they use light weight in the WARS

      • Raptor Fred

        Certainly a significant attribute to the current battles on the Moon and Mars.

  • Wolfgar

    He did a pretty thorough job, nice. To be real most AR owners could shave necessary weight by skipping some meals. It is kind of ridiculous shaving weight off an already light firearm platform while ones belly hangs over their belt. Just saying.

  • Flounder

    This is the best resource for accurate parts weights I have ever seen.

  • Mike Cramer

    Assemble the gun to suit the purpose for it. It weighs what it weighs. Go to the gym.

  • Metallica

    Heavy Barrel – HB concept is dying there is no question about it after the invent and access of terrifically strong and light weight materials that can withstand pressures and fatigue even if the wall thickness is low ! nano hard coatings do the rest

  • raz-0

    I went and spot checked this against stuff I have weighed.

    It’s apples and oranges all over the place To be useful they need to specify what you are weighing. At least for the user weights.

    You have stocks mixed as to weights with and wihtout buffer tubes included, Forearms with variable quantities of hardware installed. etc.


    It is less fubar than other attempts to date, I’ll give it that.

    • AR15 Lightweight

      There was some consideration to the idea of having seperate lists for stocks…those that fit standard receiver extensions and those that use their own proprietary one, but next thing you know you’ve got 4 tabs just for stocks (carbine extensions, rifle extensions, proprietary ones, etc.) and it just becomes excessive with respect to how many tabs you have. Compared to rails there really isn’t that many stock options for the AR platform. Maybe 150-ish if you include obscure stuff. With that short of a list, I decided to combine them into a single list and include notes on these issues (like the carbon fiber “stocks” that include the extension, built in) so that prospective users can do the math and figure out what the best option for them is. By and large, the list is accurate top to bottom. If you want the lightest stock money can buy, it IS Smoke Composites, and the SC unit is #1 on the PWD. As mentioned in the ‘rules’ page, the PWD is supposed to be the begining of your parts-conscious build, not the end. 😉

  • Rogertc1

    Pictures a suppressor

  • Rex

    Some of us actually are looking for heavier guns. I have a pacemaker implanted right where the butt fits against my shoulder, so I need to minimize recoil. Padding on shoulder and padding on butt only does so much. I’m currently looking at heavier target-style AR-15 variants.

    • AR15 Lightweight

      The PWD would be just as helpful for you as it is for the ultralight crowd. Sure, the focus *started* with light stuff, but we don’t discriminate in the PWD anymore. We’ve got bull barrels and comp super-heavy rails too. All you have to do is scroll to the bottom of the list instead of checking out what is on “top”. 🙂

  • AR15 Lightweight

    You’re welcome, Ray. I do what I can. 🙂 The data for the PWD comes from many sources, and users have added their own parts to the list, but for just pure data entry and researching www sites, and watching youtube reviews, and collecting data from forums etc, I did about 95% of the ‘work’. I have some OCD, might as well put it to good use!