CynthiAWP - Long Draw High Power Cynthia

The CynthiAWP is a closed-bolt long-draw variant of Sillybutts' Cynthia, capable of 300 FPS on a full-length K25 spring!

Stats and Performance:

• +35mm draw length VS Cynthia

• +55mm blaster length VS Cynthia

• Closed-bolt design

• Fits full-length springs

• Rigid, rattle-free construction

• ~200 FPS capable with 788 and 18 inch .509

• ~300 FPS capable with K25 and 22.5 inch .509

Bill of Materials/Sellers:

Bill of materials: https://docs.google.com/spreadsheets/d/1iqQNglQRROI4k6thqBFehN5KLgvnAtP4aFLzYeaawHk

Hardware sellers:

• Out Of Darts: https://outofdarts.com/products/cynthia-hardware-kit

  • (full kits available via special-order modifications to Cynthia kit. ~$10 upcharge.)

• Silver Fox Industries*: https://silverfoxindustries.shop/products/cynthia-hardware-kit

• A full list of sellers, including more readily available kits for non-US sellers, is available at https://www.stuffbysilly.com/wheretobuy.* **

*Ability of this shop to make full kits via special-order modifications is currently unknown, as is price increase from doing so.

**Kits and/or parts from this shop may not be hobby-standard and/or may contain metric hardware. CynthiAWP is not designed around metric hardware and compatibility is not guaranteed.

Part Options:

• Left and right handed bolt variants

• Multiple grip options

• Multiple trigger options

• Multiple mag release options

• Multiple bolt lengths and shapes

• Optional thumbhole stock

And coming soon:

• Alternate shroud options

• Multiple buttplate lengths and sizes

• Rear bottom rail option for mounting monopods

• Dovetailless MidBlock and BackBlock for super fast maintenance and assembly

• A true AWP-style bodykit

• Custom embossed, engraved, and/or multimaterial aesthetic designs

Print Information:

Currently, only the modified parts for the CynthiAWP are contained in the fileset. (Permission from Sillybutts to provide the unmodified essentials from the Cynthia fileset on this page for ease of access is currently pending, as is permission to include all required parts in a .3mf file for ease of printing.)

For the modified parts:

• 100% infill, 8+ walls - PlungerRod

• 100% infill, 5 walls - BoltBase

• 100% infill, 5 walls, brim - MidBlock (only necessary for the first 33mm of the print - for 33mm and above, use 20%)

• 20% infill, 5 walls, brim - BackBlock, ShroudFront, ShroudMid, ThumbholeStock, all Rails (use mouse-ear brims for Rails if available)

• 20% infill, 5 walls - all other parts

• In addition, all the Shroud parts benefit from supports, as does the PTGuideBase (use a support modifier on only the bottom ringed recess if available).

  • Avoid adding supports to the MidBlock and Backblock, as this can cause support to generate inside the holes meant for the C4 bars and become very hard to remove.

• To minimize the chance of print failures, it is recommended to print tall parts such as the BackBlock, MidBlock, and Shroud pieces one at a time.

For the unmodified parts, go to the original Cynthia file set and print one of each of the following according to Sillybutts' recommended settings:

• GripBody

• Grip_L

• Grip_R

• MagwellChin

• MagRelease

• BoltHandle

• PlungerCap

• Trigger

• TriggerGuard

• Catch

• CatchPusher

• Stock

• MuzzleNut

Assembly:

Assembly is somewhat similar to your typical Cynthia, but there are a few notable differences:

• When gluing up the plunger tube, two-part epoxy is extremely highly recommended for ensured blaster longevity. CA glue is not known to hold up, especially at higher spring loads. E6000, though untested, may be a suitable alternative, but epoxy is currently the only adhesive that has been tested and confirmed to keep the bolt assembly together over thousands of shots.

• You'll need to slot the BackBlock into the PTGuideBase before attaching the PTGuide - the finished assembly won't fit into the BackBlock otherwise.

  • The PTGuide may prove challenging to screw into place while inside the BackBlock - a pair of long needle-nose pliers is recommended to help brace the PTGuide against the PTGuideBase while screwing everything together.

  • The PlungerRod can also be inserted through the PTGuide and PTGuideBase to help keep everything aligned.

• The DartGuide and ShroudRear have a large dovetail that holds them together. This dovetail has an intentionally tight tolerance to minimize flex in the blaster and help keep everything rigid without the presence of a threaded rod in the Shroud.

  • When putting the two parts together, test the fit to ensure the tightness is correct. The two parts should be able to come together with several moderately light taps from a rubber mallet.

  • If light taps from a mallet will not combine the parts, sand lightly on the sides of the dovetail on the DartGuide and try again. Repeat until the parts fit with appropriate snugness.

• When closing up the rear of the blaster, you will need to gently pry the dovetail that holds the MidBlock and BackBlock together upwards using the lip on the open side of the MidBlock before slotting the BackBlock into place.

• Shroud assembly is different but pretty intuitive, as is Magwell assembly.

The Why of It:

I’ve always loved my Cynthia, but have also long wished it hit harder and felt it was a bit small and short in the stock, like a carbine cosplaying as a rifle. I wanted a bigger, longer Cynthia, with more pull, more power, and a more comfortable user experience - and I wanted a bolt-action blaster that could clear the 300 FPS barrier and make 200 FPS a breeze to prime without paying through the nose for a Kunlun or Kirin. Something that really felt like a true-blue sniper rifle, without a matching price tag.

This was the result of that wish - a beast of a blaster that easily reaches 300 FPS and is probably capable of even more, while costing only $60 as a hardware kit and $20 in filament and being far more rigid than the original Cynthia. Its size is comfortably large without being unwieldy, and yet it weighs far less than other common high-FPS blasters such as the Caliburn or Perilous.

To my knowledge, this is one of the only publicly available and printable bolt-action blasters that easily clears 300 FPS - and it's also arguably my most complex and well-developed design to date, as well as undoubtedly my best work. And I'm pretty proud of that.

If you print one of these, or anything I've made, I'd love to see it! Send me a message or photo on Discord (@crispy_corndog), Reddit (u/crispy_CORNDOG), or post a make here.

Credits And Thanks To:

Sillybutts, for the fantastic rifle that inspired this project and the truly honorable open-source philosophy that allowed it to come to fruition

Shadow-_-Dancer, for the open-source closed bolt kit that greatly improved the rigidity, quality, and safety of this design

The BCFF Nerf group, who was extremely welcoming and willing to house me and my silly little project amidst their vast array of much more technically impressive prototypes

My beta testers, including NecessaryOk6815, robocommander, daten99, and atlasunit22, for helping to refine this blaster into what it is today while putting up with my sporadic availability and constant failures to check my DMs

My nerfing friends and the CANE Nerf group, who were interested and invested in this idea even back when it was barely a spark in my brain - this project probably would have been an abandoned concept without them

Changelog:

1/5/2026 - Initial release

Unfortunately Necessary Statement:

Disclaimer: This is not a toy. This blaster is meant for hobbyists, not children. Blaster must be operated correctly to avoid injury. I am not responsible for any injuries from this blaster. Please use a bright/blaze orange muzzle and barrel cap on this blaster. Consult local laws before building this high powered blaster.

More Unfortunately Necessary Statements:

NONE of the files found anywhere on this Printables page or account are to be used to produce blasters for commercial sale without first contacting myself and, if applicable, the designers of any and all of the original filesets, and negotiating a contract. 

Additionally, NONE of the files found anywhere on this Printables page or user, or any account under the name crispy_CORNDOG are to be downloaded, modified, sold or otherwise utilized in any manner by the business known as Frontline Foam, or any of their affiliates. By downloading this fileset or any others published by crispy_CORNDOG on any platforms, you agree that you are not in ANY WAY under or working with or for Frontline Foam and/or related to Frontline Foam or Derrikk Sun. 

Violators of the above statements, or of any other legal clauses in the Creative Commons License, will be prosecuted to the fullest extent of the law.