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railed
The rail profile is the cross sectional shape of a railway rail, perpendicular to its length.
Early rails were made of wood, cast iron or wrought iron. All modern rails are hot rolled steel with a cross section (profile) approximate to an I-beam, but asymmetric about a horizontal axis (however see grooved rail below). The head is profiled to resist wear and to give a good ride, and the foot profiled to suit the fixing system.
Unlike some other uses of iron and steel, railway rails are subject to very high stresses and are made of very high quality steel. It took many decades to improve the quality of the materials, including the change from iron to steel. Minor flaws in the steel that may pose no problems in other applications can lead to broken rails and dangerous derailments when used on railway tracks.
By and large, the heavier the rails and the rest of the trackwork, the heavier and faster the trains these tracks can carry.
Rails represent a substantial fraction of the cost of a railway line. Only a small number of rail sizes are made by steelworks at one time, so a railway must choose the nearest suitable size. Worn, heavy rail from a mainline is often reclaimed and downgraded for re-use on a branchline, siding or yard.
PSA 10.5" 9mm 12" Slanted M-Lok Railed Upper
Includes bolt carrier (Gen1) and charging handle.
Only shot once, one 50 round box. Ran fine, I just put a side charging upper on my AR9 and only shoot with it now.
Asking $300.00
PSA 4" barrel 9mm Odin 5.5" K-Mod railed Upper.
No bolt carrier or...
This MI/PSA 9" Ultra Lightweight One-piece Free Float M-Lok Handguard came as part of a PSA pistol kit that I am no longer using. It is lightly used, but it is solid, super light, and comes with installation instructions, barrel nut, and all the hardware originally included! If you're putting...
First "I'll take it" posted unconditional is the new owner
cross posted on the web "First I'll take it" time stamp rules rules all
PRICE $250 CASH
Note: PM confirming the purchase commitment
Partial trades would M5 butt stock
Need a BCG maybe Tool Craft or other quality BCG
PSA 16"...
I have a new, unbuilt Brownells 10/22 takedown receiver - model BRN-22TR. Ready to go for that next build.
Local transfer at buyer’s expense, or I can ship to your FFL for $30.
Asking $140
I have a new, unbuilt Brownells 10/22 receiver - model BRN-22R. Ready to go for that next build you’ve been wanting to do.
Comes with v-block and screws. Local transfer at buyer’s expense, or I can ship to your FFL for $30.
Asking $90
Have 5 sets of the Arm14F railed upper and lower hand guards sets only. The lowers have heat shield. Make your milled sam7sf or other milled a quad railed machine.$185 Shipped Discreet PayPal. Also put together a complete set for those who don’t have any of them. Arm14F railed upper and...