Guide to Caliburn Upgrades

You can get many upgrades for your Caliburn. Some upgrades boost performance, some are for aesthetics. Either way, in this post, I’ll give some pros and cons of many Caliburn upgrades, as well as share my own personal Caliburn setup. 

Basic, Must-Have Upgrades

Before you get any other upgrade, I recommend you get these few first. These upgrades will boost your FPS and general durability of your blaster. 

Notched Ramcore for O-Ring

This upgrade gives you a notch on the tip of your Caliburn pusher for an o-ring, which creates an extra air seal in the barrel that’s not there by default.  Even with a default Caliburn setup, this o-ring should boost your FPS by about 20. 

Coupler Inserts

If you accidentally dry-fire your blaster (ie, fire without a dart), then you risk cracking your magwell. These aluminum inserts strengthen the magwell so it’s far less likely to crack or fracture with dry-firing or even rough play. Makes the most vulnerable part of your blaster virtually indestructible. 


I’d recommend the railgasm for cosmetic reasons, but it also increases the overall rigidity of your blaster. Also, it’s nice to have a rail for attaching other addons. 

I wouldn’t recommend getting any other upgrades before you have these. Each of these upgrades are selected by default on the Caliburn listing

Performance Upgrades/Accessories

Once you have the basic upgrades and would like something more, I’d recommend more performance upgrades. 

Machined Plunger & Rambase

The default Caliburn setup has a 3D printed plunger and rambase which gives a lower-quality air seal, and also wears out faster over time. 

Alternatively, you can swap out your printed plunger for a machined plunger and rambase made out of of acetal (your choice of either black or white), or aluminum. These parts are more durable, get a much better air seal. They’re also a must if you want a heavier spring load. 

You can expect a 20-30 FPS boost with an upgraded plunger and rambase. 

Upgraded Spring

A heavier spring will give you higher power. The default spring for a Caliburn is a K25, but there are many other and better springs to choose from. For more information on springs, click here: The Ultimate Guide to Springs 

You can also stack some springs and use them together for even more power. 

Upgraded Barrel

The default Caliburn barrel is a 14″ .527 barrel. Increasing the barrel length to 18″ and/or getting a smaller bore barrel (.509) will give you higher power. I personally recommend an 18″ .509 aluminum barrel if you’d like to upgrade.

If you want top performance, you’ll have to get a brass barrel. Brass is known for its high power, but it is also finicky and fragile. For more info on brass, click here: How to Get Top Performance with Brass

Suppressor Scar

Scars are very helpful for more accurate shooting and tighter groupings. I recommend this Scar designed by Captain Slug. The Scar slides onto the end of your barrel and then is clamped on by a few screws. I see a huge difference in my accuracy when I use a Scar. 

You can dial in your Scar to fit your particular setup. 

Cosmetic Upgrades

I prefer performance-boosting upgrades or otherwise practical upgrades, but there are certainly a huge variety of cosmetic upgrades that are fun to choose from. 

Angled Foregrip

You can technically prime your blaster without a foregrip, but having one is really nice. Out of all the foregrip designs, I personally recommend the Angled Foregrip because it seems to be most comfortable. You can try out others, though. I print a variety of them. 

A foregrip is also necessary if you order a Doom or Stampede shroud. 

Grip Insert

Grip inserts are cool because they add a little extra color, but also give you your choice of a sling point or standard nerf stock attachment. I’ve never used neither a sling point or the stock on a Caliburn, but I do know some people that find them useful. 

Threaded Rod Covers

The default threaded rod covers work just fine, but you can also get a carbon fiber or metal upgrade. I think the colors of either look dope, but also give extra rigidity to your blaster as a whole. I run carbon fiber on my Caliburn. 

Doom Shroud

Instead of a railgasm, you can upgrade to a doom shroud. This shroud supports the top and bottom of the blaster. Also, you get a cool under carriage color and extra style. Cons are that you must use a grip to prime your blaster because the shroud covers the majority of the shuttle. Also, you might notice a louder sound when priming as the shuttle slides on the shroud. But it does look super maxed-out and awesome. 

Shroud Addons

You can add a front shroud (RMAX) and/or a shroud on the back (Stampede) to your blaster. Both are basically just cosmetic, but they do give you more options for rails on the top and on the sides. Shroud addons are definitely required if you’re going for a totally maxed-out look. 

Colored Power Spring

Turf Blaster Springs makes upgraded versions of the default K series springs. The Pro25 and Pro26 come in a variety of cool colors. You can match your spring to the look of your blaster. 

Excited yet? Hopefully this gave you an intro to the upgrades possible for the Caliburn. 

There are many more Caliburn addons and upgrades, but these are the ones I recommend most. You can check out more here on the Caliburn Assembled Listing

You can get a default Caliburn for cheap, and then gradually add more upgrades, or you could also jump straight into the highest performing Caliburn with a ton of upgrades, like Bradley Phillip’s for example. 

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