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6.8 SPC Barrels and Upper Components:

- KT68 Custom Upper Build
KT68 Custom Upper Build Service. Order barrel and parts on this page, send to Ko-tonics other parts that you wish to have built into your custom KT68 upper, and we will build and test fire your new upper. Same satisfaction guaranty and warranty applies as our standard KT68 uppers.
Price: $95.00 Quantity:




* 16-inch Chrome-lined 6.8 SPC Barrel - SPR
16 inch 6.8 SPC barrel with chrome-lined chamber and bore, 1:11" twist four-groove rifling, 5/8-24 threaded muzzle, M4 feed ramps on barrel extension, mid-length gas port, SPR profile, Cerakote black finish.
Price: $215.00 Quantity:




* 16-inch Lightweight Chrome-lined 6.8 SPC Barrel
16 inch 6.8 SPC lightweight barrel with chrome-lined chamber and bore, 1:11" twist four-groove rifling, 5/8-24 threaded muzzle, M4 feed ramps on barrel extension, mid-length gas port, SPR profile, Cerakote black finish.
Price: $225.00 Quantity:




* 16-inch unfinished 6.8 SPC barrel
Unfinished barrel, with no gas port hole. This barrel has the same chamber and 4-groove, 1:11" twist rifling as our other barrels. Chrome-lined, with barrel extension installed. Order this if you wish to have a barrel trimmed and reprofiled into a short barrel configuration. Ko-tonics does NOT reprofile or cut barrels shorter than 16".
Price: $185.00 Quantity:




* 18-inch Chrome-lined 6.8 SPC Barrel - SPR
18 inch 6.8 SPC barrel, with chrome-lined chamber and bore, 1:11" twist four-groove rifling, 5/8x24 threaded muzzle, M4 feed ramps on barrel extension, mid-length gas port, SPR profile, Cerakote black finish. *** TEMPORARILY OUT-OF-STOCK ***
Price: $0.00 Quantity:




* 20-inch Chrome-lined 6.8 SPC Fluted Barrel
20 inch 6.8 SPC barrel with chrome-lined chamber and bore, fluting at handguard area, 1:11" twist four-groove rifling, 5/8-24 threaded muzzle, M4 feed ramps on barrel extension, rifle-length gas port, Cerakote black finish.
Price: $265.00 Quantity:




* IonBond DLC Tungsten-Carbide Barrel Finish
Optional KT68 barrel finish upgrade from Cerakote Graphite Black to IonBond DLC (Diamond Like Coating) chrome tungsten-carbide coating. May add four weeks to shipping, check with Ko-tonics for an estimated ship time.
Price: $50.00 Quantity:




* KT68 Bore Lapping Service
KT68 bore lapping service for chrome-lined barrels. A combination of fire lapping and hand lapping of the barrel bore through three grades of abrasive. Does not harm chrome lining, smooths and polishes the bore, increases accuracy and reduces fouling.
Price: $50.00 Quantity:




* Lefty Barrel Upgrade
Lefty barrel upgrade. Remove M4 barrel extension, install Stag Arms ambidextrous barrel extension, cut feed ramps to M4 shape & size
Price: $35.00 Quantity:




> Flip Sight Gas Block
Flip Sight Gas Block without bayonette lug (YHM-9395)
Price: $75.00 Quantity:




> MI Low Profile Gas Block
Midwest Industries low-profile gas block. Although the MI low-profile gas block is small enought to fit under many handguards, it is too large to allow a LaRue railed forend to pass over it during assembly. Choose the PRI instead if you will be building with a LaRue railed forend.
Price: $45.00 Quantity:




> Single Rail Gas Block
Single Rail Gas Block (YHM-9385A)
Price: $48.00 Quantity:




> YHM Low Profile Gas Block
Low profile gas block (YHM-9381A) for 0.750" barrels. Fits under all YHM, JP and some other handguards and free-float tubes. If it is to be installed under narrow handguards, (LaRue, Daniel Defense, etc.) or standard two-piece handguards with heatshields, order the Midwest Industries gas block below.
Price: $35.00 Quantity:




Handguard Cap
Triangular handguard cap
Price: $4.00 Quantity:




M4 Upper Receiver
Stag Arms / Continental Machine Tool M4 upper receiver. M4 feed ramp extensions, slot numbers, complete assembly
Price: $120.00 Quantity:




Mid-length gas tube + pin
Mid-length gas tube for the above barrels. Includes gas tube roll pin.
Price: $11.00 Quantity:




Standard Barrel Nut
Standard barrel nut
Price: $6.00 Quantity: