a) Continuous flat steel plates all the way to the trap;
b) Ceiling baffles to protect overhead projections and joists;
c) Continuous ceiling of sandwich construction; or
d) Combinations of theme treatments.
Final design should provide protection from stray bullets
penetrating wood ceiling members and prevent ricochet from wood joists, steel
bar joists, and concrete pen construction.
Floors. The preferred material is flat concrete slab or equivalent.
Cover non-bulletproof floors of converted buildings with protective shield
suitable for the most powerful cartridge authorized for range use. This
coverage shall extend a minimum of 12 ft (3.66 m) in front of the firing line
for all ranges, and 3 ft (0.914 m) behind the firing line when occupied rooms
are below. The remainder of the floor from the end of this shield to the
bullet trap may be covered with steel plating or suitable sandwich
18.104.22.168 Walls. The preferred material is flat reinforced concrete or
corefilled masonry. Cover non-bulletproof walls of converted buildings with a
protective shield suitable for the most powerful cartridge authorized for
range use. Shield shall extend a minimum of 12 ft forward of the firing line
for all ranges and 3 ft behind the firing line when occupied rooms are
adjacent. The remainder of the non-bulletproof wall extending to the bullet
trap may be treated with a combination of flat steel plate, baffles, or
sandwich construction. Cover the sidewalls at the bullet trap with steel
plate of same thickness as the bullet trap for a distance of at least 2 ft
(0.61 m) forward of the leading edge of the bullet trap.
Protective Steel Plate. Cover non-bulletproof floors and sidewalls
of converted buildings with steel plate or bullet absorbing sandwich panels.
Provide safety baffles set at 30 degrees to the line of fire across the range
at intervals down the range ceiling to provide protection from stray bullets.
penetrating wood ceiling members and to prevent ricochet from wood joists,
steel joists, and concrete pan construction. Thickness of steel plate or
sandwich panel shall be able to withstand the most powerful cartridge to be
used on the range. Commercially available baffles may be used. The angle of
impact upon the plate will be the determining factor in selecting plate
thickness to prevent penetration. Use of range for 5.56 mm and 7.62 mm rifle
service ammunition must be determined during pluming phase. Where there are
rooms above, below, or beside the range, minimum plate thickness between the
range and the rooms, in accordance with the angle of impact the bullet
trajectory makes with the surface, shall be as shown in Table 1.