Close this search box.

Cash to Burn? Spare Parts & Magazines

This article contains affiliate links.

I want to start off by talking about a moment at a class from several years ago. it was a cold Thursday afternoon in October, and I was standing over my rifle as it lay in the dirt. We were between drills and I was growing increasingly frustrated at its failure to feed malfunctions. It was at this point that the school’s resident weapons guy strolled up behind me to look it over.

Now, the primary cause of my issue was lubrication, but that’s not the point of the story. The instructor, Scott, turned back to the rest of the class to give his thoughts on “spare parts.” The best spare part you can have, he said, is another rifle. But barring that, each of us should plan to have a spare complete bolt carrier group and lower parts kit for each rifle, and we should keep it with us.

Related Links


I’ve noticed a trend during 2020 where the kinds of “gun stuff” that’s getting very difficult to come by are complete firearms and ammunition. I think this stems from most of the panic buying coming from new shooters who don’t quite know what else they need to look out for. On the other hand, I can still readily find important spare parts like bolts, springs, detents, and even magazines.

In an uncertain future, where we don’t know when complete AR-15s will come back to the shelves (if ever), I think it’s important to start thinking about how we keep our gear “in the game” for the long haul. That means keeping items on hand that we’re going to need for routine maintenance.

Back to Scott

Of course we can all build up a stash of individual spare parts, and we probably should. What stood out to me about Scott’s advice that day was the practicality behind it. He was thinking operationally. Should you be in the middle of a match, range trip, or community patrol (if it comes to it) and your rifle goes down with a broken bolt or some other breakage, it’s far easier to remove and replace the complete bolt carrier group. The alternative is field stripping the bolt, or carrier, and fiddling with small parts you might lose in the field. Who knows how long that would take while you are otherwise on the clock.

Of course, complete bolt carrier groups can get relatively expensive. So it’s fine to break it down into the constituent parts. 

  • Bolt
  • Extractor
  • Extractor spring
  • Gas rings
  • Cam pin
  • Firing pin
  • Firing pin retaining pin
  • Gas key
  • Bolt carrier

Lower Parts

As for the lower, there are a lot of little springs and detents. The most important, in my opinion, is the trigger springs and buffer spring (as well as the retaining pin for when you inevitably lose it). 

It’s ideal to keep a whole lower parts kit around, though. Just in case.

But what about…

Two more items on my list. First, consider keeping a few spare barrels around. Yes, I’m aware that I’m advocating enough spare parts to build more rifles if you wanted. Perhaps you could down the line, but the goal is to have enough of these things around to keep your existing rifle in the game for as long as possible.

And don’t forget magazines. They are still relatively available right now, and they don’t last forever It makes sense to stock up on items that wear out over time, especially the ones that don’t have serial numbers and are difficult to keep track of for any kind of “system.”

How many mags do you need? Well, there’s no good answer for that. I started along this shooting journey with an idea of “10 magazines per rifle.” We’re long past that now.

Wrapping Up

There you have it. This was a short episode to touch on a few thoughts I’ve had lately. If you’ve got some funds to spend, but can’t find ammunition or new weapons, I think it’s a good time to build up your supply of spare parts and magazines. What do you think?

Picture of Matt


Matt is the primary author and owner of The Everyday Marksman. He's a former military officer turned professional tech sector trainer. He's a lifelong learner, passionate outdoorsman, and steadfast supporter of firearms culture.

Check These Out Too


Notify of

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Oldest First
Newest First

Matt – perfectly said! I have been doing that very thing since discussing it with you in a reply to an earlier post. Trying to keep within my shooting/firearms budget I find it somewhat challenging (in a good way) to find the parts and then decide on the quality/cost ratio I can live with. I haven’t really put my ‘entry level’ weapons through the ringer but having spare parts – especially the ‘wearing and moving’ parts just makes sense. I’ve also grabbed up a few ’10rnd’ mags – JIC! Slightly off subject and again not having spent a great deal of ‘field time’ with my rifles – I prefer the FSB front sight on an AR at this point as I am comfortable with it. Could you suggest one of your articles or even a direction to look for red dot optics/mounts that co-witness with a FSB (I have the removable carry handle M4 receivers)? I have one upper that doesn’t have a FSB and I intend to put a good scope on it for longer reach. I’m just not running across info on red dots that co-witness with FSBs. I have two Gen 1 (older model) Vortex StrikeFire red dots with the straight vertical mounts (versus the newer cantilever style) but haven’t mounted and don’t know if they co-witness or not? I’ll probably need to replace the batteries – had them a while in parts storage!

Thanks – Paul

Replying to  Matt

Thinking more about this ‘spare parts’ theme, why not take advantage on the compatibility of the AR15! I find having a few extra complete upper assemblies (in different configurations if you want) ready to snap on a lower is a mighty convenient way to rectify a ‘rifle down’ situation. I’m not recommending stuffing an upper in your rear pocket every time you go shooting but having a ready to go upper can keep you shooting and maximizes your precious training time. Later you can repair any problems with the ‘down’ upper with your cache of spare parts. This applies to lowers as well since many AR problems originate there. I have a fixed rifle stock lower as well as one with the multi-position M4 type stock. We all have our preferred ‘set ups’ to train with but range time is vital – I’d rather be shooting than throwing my broken rifle back in the truck and going home! The idea is to always have 1 rifle ready to go!

Adventure Awaits

+ Newsletter
+ New Content Alerts
+ Deals and Sales

Subscribe now

Affiliate Links

Or...How The Everyday Marksman Makes Money

I would write for the site and produce content for free if it was practical, but domains, webspace, and other online services cost money. Not to mention practice ammo and gear to review.

So what is an affiliate link? There are times where I link to specific products or companies that I recommend. If you click on the link and buy something, then I receive a small commission, typically 3% to 5% of the sale.

It’s not much, but it adds up over time.

Some Frequently Asked Questions:

No, my commission comes at no additional cost to you. It’s simply an arrangement I have with the retailer.

My primary goal is providing you with quality information and recommendations. I often link to products and companies that I receive nothing from because I genuinely think it’s a good product.

If I can also get a percentage from a retailer selling the product, then great, but it’s not a primary motivator.

Check out my affiliate disclosure page, which has a bit more information. You can find that by clicking on this link.

The Everyday Marksman is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for website owners to earn advertising fees by advertising and linking to,, and any other website that may be affiliated with Amazon Service LLC Associates Program.