Chamber profile is dimensioned from a physical reference gun supplied by the customer, measured at the stock width, receiver depth and overall dressed length. A sample is produced and test-fitted against that firearm before the profile is committed to production tooling, because a profile change on a welded shell is a tooling change rather than a pattern adjustment.
A rectangular case of the same length and width encloses approximately 40 L against 25–30 L for the chambered shell. The difference is volume the firearm does not occupy, concentrated at the muzzle end where a rectangle retains full width and the contoured chamber tapers with the barrel.
Rounded buttstock chamber and tapered barrel chamber
A gun is wide at the stock and narrow at the muzzle. A rectangle sized to the widest point carries that width all the way to the end.
| Measure | Contoured SL-E603 | Rectangle of the Same Length and Width |
| Internal capacity | approx. 25–30 L | approx. 40 L |
| Volume occupied by the firearm | Most of it | Roughly two thirds |
| Dead space at the muzzle end | Minimal — the chamber tapers with the barrel | Full width retained to the end |
| Room for the firearm to shift | Limited | Substantial at the muzzle |
| External bulk carried | Follows the gun outline | Squared off; wider silhouette |
The dead space is the point. Volume a firearm does not occupy is volume it can move within, and movement inside a case is what produces contact wear at the muzzle end on generic rectangular bags.
A stock is the widest and most awkward part of a long gun, and squaring the case around it leaves two corners that fill with grit and hold water after cleaning. A radiused chamber gives the stock room without creating those corners, and on a welded shell the radius is formed by tooling rather than folded from flat panel.
The taper follows the barrel down toward the muzzle, removing width where the gun no longer needs it. Contoured Waterproof Gun Case reduces both the case volume and the external silhouette, which is what makes the case slide into a rack or behind a seat rather than needing a rectangular slot.
| Stated plainly:a contoured case fits its intended firearm profile closely and other profiles less well. A rectangle accommodates almost anything of the right length. Buyers with a wide firearm range across one SKU should weigh that — we recommend confirming the chamber profile against the widest and the most heavily dressed gun in the intended range before tooling is cut. |
Tooling is the other cost. Chamber profiles are welded on dedicated electrode tooling, so a profile change is a tooling change rather than a pattern adjustment. We quote it explicitly at the development stage rather than folding it into a unit price.
1. Send the widest and longest gun in the intended range, dressed as the user carries it
2. We measure stock width at the comb and butt, receiver depth, and overall dressed length
3. Chamber radius and taper are set against those figures with working clearance
4. A sample is produced and test-fitted against the reference gun before tooling is finalised
5. Only then does the profile go to production tooling
Working from a drawing rather than a gun is where contoured cases go wrong, because drawings omit slings, recoil pads, and mounted optics.
| Item | Specification |
| Model | SL-E603 |
| Product type | Fully welded waterproof rifle case |
| Size | 122 × 30 × 8 cm (estimated) |
| Weight | approx. 1.1 kg (estimated) |
| Internal capacity | approx. 25–30 L |
| Shell material | 840D TPU laminated fabric |
| Construction | RF welded, one-piece body |
| Seam type | High-frequency welded, heat-sealed edges |
| Waterproof rating | IPX7 |
| Closure | Waterproof zipper |
| Accessory pocket | 1 welded waterproof zippered pocket |
| Profile | Rounded buttstock chamber, tapered barrel chamber |
| Carry | Adjustable removable shoulder strap + reinforced handle |
| Colourways | Khaki / Black / Army Green, two-tone |
| Firearm compatibility | Hunting, bolt-action, tactical rifles; shotguns |
| MOQ | 300 pcs |
| Sample lead time | 7–10 days |
| Production lead time | 30–45 days |
| OEM / ODM | Supported |
| Origin | China |
| Option | Notes |
| Buttstock chamber radius | Set against the reference gun's stock width |
| Barrel taper angle | Adjusts muzzle-end volume and external silhouette |
| Chamber depth | Deeper chambers for adjustable combs and mounted optics |
| Body length | 48 in and 52 in quoted; custom lengths tooled |
| Shell material | 840D TPU standard; 500D PVC tarpaulin alternative |
| Pocket position | Placed to suit the contour of the chosen profile |
| Colour split | Two-tone welded panels following the chamber division |
| Reference gun test fit | Included in sampling for contoured programmes |
6. Reference gun measurement and chamber profile confirmation
7. Electrode tooling development for the buttstock radius and barrel taper
8. Incoming fabric inspection and weldability trial
9. Welding parameter setup and first-article peel test
10. Precision cutting of panels to the chambered development
11. RF welding of the buttstock chamber and tapered barrel section
12. Sealed zipper and welded pocket attachment
13. Test fit against the reference gun profile
14. Immersion verification and final inspection
| Check | Method | Frequency |
| Chamber dimensions | Measured against approved tooling | Sampling |
| Buttstock radius weld | Visual at the curved section | 100% |
| Taper consistency | Weld width measured along the taper | Sampling |
| Test fit | Against reference gun profile | Sampling |
| Zipper-to-shell weld | Full-run inspection | 100% |
| Immersion verification | IPX7 condition on a finished unit | Per approved sampling plan |
| Trial | Method | Outcome |
| Dressed-gun fit | Cased with a slinged rifle and mounted optic | Closed without forcing at the specified chamber depth |
| Internal movement | Loaded case carried and transported over uneven ground | Firearm held position; no muzzle-end travel |
| Corner retention | Case rinsed and inverted after immersion | Radiused chamber drained; no water held in corners |
| Curved weld integrity | Peel test at the buttstock radius | Held equally to straight-section welds |
| Silhouette check | Case slid into a vehicle rack and shelf slot | Tapered profile cleared where a rectangle did not |
| IPX7 immersion | Finished unit, 1 m for 30 minutes | No ingress at any welded seam or the closure |
Brands building around a defined firearm range rather than a universal case; vehicle rack and gun room programmes where external silhouette decides fit; guided fleets carrying a consistent gun type; markets where a case is judged on how it looks alongside the firearm; and any programme prepared to invest in tooling for a closer fit.
The brand's rifles carry adjustable combs, which sit higher than a standard stock and would not clear a chamber tooled to a conventional profile. We measured a supplied reference rifle at the comb rather than the butt and set the chamber depth accordingly before cutting tooling. 400 pcs, 46 days including tooling.
The rack slot was rectangular but shallow, and the deciding factor was external silhouette rather than internal volume. The tapered barrel chamber cleared the slot where a full-width rectangle would not, and we adjusted the taper angle slightly at sampling to gain the last centimetre. 550 pcs, 44 days.
A consistent fleet gun type made a contoured case worthwhile, since every case would carry the same profile. We test-fitted against two fleet rifles before tooling and confirmed the chamber suited both. 350 pcs, 45 days.
“Adjustable combs are taller than a drawing suggests. Measuring the actual rifle at the comb is why the first sample worked.”
— Product Engineer, Rifle Brand
“The rack decided it. A rectangle of the same capacity simply did not go in.”
— Programme Manager, Vehicle Rack Brand
“Rinsing it out after a wet day, the rounded end actually drains. Our old square-cornered case held water in the corners.”
— Head Guide, Guided Operation
A gun is wide at the stock and narrow at the muzzle, so a rectangle carries full width to the end and encloses roughly 40 L against 25–30 L for the contoured shell. That extra volume is dead space the firearm can move within, and movement is what produces contact wear at the muzzle end.
It gives the stock room without creating square corners that fill with grit and hold water after cleaning. On a welded shell the radius is formed by dedicated tooling rather than folded from flat panel.
It removes width where the gun no longer needs it, reducing both internal volume and external silhouette. That is what lets the case slide into a rack or behind a seat rather than needing a rectangular slot.
It fits its intended profile closely and other profiles less well, where a rectangle accommodates almost anything of the right length. Buyers covering a wide firearm range on one SKU should weigh that carefully.
Against a reference gun sent by the customer, dressed as the user carries it. We measure stock width at the comb and butt, receiver depth, and overall dressed length, then set radius and taper with working clearance.
We advise against it. Drawings omit slings, recoil pads, and mounted optics, which is where contoured cases usually go wrong. A physical reference gun is the reliable route.
With the chamber depth set for it, yes. Adjustable combs sit higher than a standard stock, so we measure at the comb rather than the butt when that is the intended range.
Yes, and we quote it explicitly rather than folding it into the unit price. A chamber profile change is a tooling change, not a pattern adjustment, because the shell is welded rather than sewn.
No. The chamber is formed by welding, and curved welds are peel-tested at the buttstock radius specifically, since that is where tooling error would show first. Immersion is verified on finished units.
Yes. A radiused chamber drains when inverted after rinsing, where square corners hold water — a practical difference after wet days.
Yes. Pocket size and position are set to suit the chosen profile rather than fixed, since a welded pocket is applied to the shell face during production.
MOQ 300 pcs, samples in 7–10 days, production in 30–45 days, quoted EXW, FOB, or CIF, with tooling quoted per project and reference gun test fitting included in contoured programmes.
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No. 88, Fenggang Section of Dongshen Road, Fenggang Town, Dongguan City, Guangdong Province, China
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