FLP-05, the Springer Perilous

This is the Springer Perilous. It is a long draw side-mag pump action threaded rod springer. It has linear rail in the prime. It has a quick swap spring cap, and uses 11" springs. It uses Talon mags.

It is capable of achieving well over 350FPS without significant difficulty.

This can also be set up for various fps caps very easily. It can use Talon Claw rams, or higher airflow brass rams. Near any hobby spring should fit in it. You can set it up for dedicated 17/32" brass barrel use, or use 16mm aluminum barrels. I've used my prototype Springers Perilous at 160, 250, 300, and uncapped FPS games. However, it truly shines at 350+.

The Springer Perilous is designed specifically for regular use at high FPS games. Turns out if you want to shoot 350, there's not much out there intended for that. You can get plenty of blasters up to that level, but they won't be pleasant to play a game with. This blaster, however, has linear rail in the prime and a thrust bearing in the spring cap. I've run K14 in this in multiple games. You can shoot the Springer Perilous all day at 350. 

The BoM is as follows:

4x 10-32 threaded rods, cut to 27.5", 4x 10-32 x 3/8" screws (with lock washer), 16x 10-32 hex nuts, 8x 4-40 x 3/8" screws, M3 screws (17x8mm, 13x12mm, 8x16mm, 1x30mm), 14x M3 hex nuts, 2x 6x7mm ball detents, Lynx plunger tube, 2x C4 bars, 9cm 16mm OD 13mmID tubing (barrel offcut), 2x aluminum rod covers (8mm OD 6mm ID, 30cm), 4 catch springs (approx 5mm OD, 15-20ishmm long?), 3x Dash 123 O rings, 3x 012 O rings, 250mm MGN12H linear rail (https://a.co/d/0PncCni), 0.75" Bore 1.25" OD Thrust Bearing (https://a.co/d/7y9bvPz), 9cm ½" brass tube (or Talon Claw ram),

And then whatever barrelling and spring you want. 16" to 30", shorter will be harder. 14" will probably fit, but I don't think that's near enough barrel. With 30" brass and brass o ring tip ram, you can expect 350ish with SF25. You can extrapolate from there, there's… there's just so many ways you can set it up.

Print Settings: 5 walls, 100 percent infill on plunger, sear, spring cap, transfer bars, o ring ram tip and trigger. 4-5 walls, 20 percent infill on everything else. Supports on plunger, spring cap, frontcap, and grip base. Maybe stock, too. Nameplate may need to be scaled down to 98 or 99 percent.

If anything will break, it's gonna be the plunger. This is a very deliberate design choice- I could make it stronger, but that starts to remove some spring compatibility. That said, print the plunger with the right settings, and mine has only broken using 40ish kilos of spring. You're not gonna hurt it on normal people springs unless you've done something very wrong.

Building Tips and Use Stuff: Don't overtighten. Be sure to use a dot of superglue for the ball detents. Prime against your shoulder, not against your pistol grip hand- that torques things wrong. Use a horizontal or low angle foregrip for springloads over normal K25 if you like your elbows. Recommend the Null Pointer by Chance ( https://www.printables.com/model/875879-null-pointer-a-zero-degree-bcar ) for aluminum barrel or the string SCAR by CaptainSlug ( https://www.thingiverse.com/thing:2863865 ) for brass.

FPS Expectations: YMMV, but testers are seeing round the same numbers as me. With brass o ring tip ram:

K25+30" barrel = 320ish

SF25+30" barrel = 350ish

SF25+K31+30" barrel = 400ish

K14+30" barrel = 420ish

K31+18" barrel = 170ish

788 +18" barrel = 210ish

TC rams will cut about 20 to 30 fps off. Tuning your seal can bring that mostly back on short barrels and lower springloads. 

Optional Pieces: There are both brass barrel/brass ram (no o ring tip) and aluminum barrel options. Aluminum barrel files are typically the way to go. There are two versions of the transfer bars: short ones are typically the way to go, long ones can lead to bad trigger pulls. Use the Chance trigger unless you are having issues with your short transfer bars. If you would like to use two sets of shorter threaded rods instead of one set of long rods, print the transfer housing for coupling nuts- you'll need 4x 16.5" and 4x 11" threaded rods, 4x coupling nuts, and 4x more hex nuts. There's also a long shroud option, which… I dunno, someone who's scared of being clumsy with a long barrel might want. You'll just use the longshroud pieces instead of the normal muzzle piece. There's a grip option with lanyard ring, and one without. 

Build Guide: https://imgur.com/gallery/UScjA07 (old version- only real assembly changes are hex nuts inside the muzzle.

Big huge thanks to Frozenfade, CMXVII, Poppy, 3DBlastedHawaii, Foamdemic, and FoxfireIndustries for their input during beta testing! Extra also thanks to Chance, for his fantastic trigger- and also the Boom Grip, which I highly recommend. Also to Sillybutts and Taffy for their input, and the Pump Skewer files, which this uses the rambase and mag release from.

Changelog:

7/16/2024: uploaded files for closer tolerances around threaded rods. Previous fileset works fine, this may just make it slightly easier to keep your parts lined up nicely.

10/10/24: uploaded Silly collet muzzle for long shroud- just grab a Silly muzzle nut too.