IISS data are solely based on international ''Known Weapons Sales''. If they have no information, they never mentioned in their year books.
Did your IISS ever mentioned about these artillery systems of Myanmar?
I accept your position that IISS does not include all the weapon in the inventory. That's why you are giving a total 580 artillery for Myanmar instead of 419+ stated by IISS. But If we apply the same logic for BD then how come you are giving a list of just 330 artillery for BD army when IISS itself is giving a count of 841+ piece ? Should not it be more than 1000 for BD army if we apply the same principle upon which you have counted the 580 artillery of Myanmar army?
Myanmar artillery
ARTY 419+
SP 155mm 42: 30 NORA B-52; 12 SH-1
TOWED 264+: 105mm 132: 36 M-56; 96 M101; 122mm 100
D-30; 130mm 16 M-46; 140mm; 155mm 16 Soltam M-845P
MRL 33+: 107mm 30 Type-63; 122mm BM-21 (reported);
Type-81; 240mm 3+ M-1985 mod
MOR 80+: 82mm Type-53 (M-37); 120mm 80+: 80 Soltam;
Type-53 (M-1943)
AT
RCL 1,000+: 106mm M40A1; 84mm ε1,000 Carl Gustav
GUNS 84
SP 105mm 24 PTL-02 mod
TOWED 60: 57mm 6-pdr; 76.2mm 17-pdr
IISS-2016, Page-276
Bangladesh artillery
ARTY 841+
SP 155mm 6+ NORA B-52
TOWED 363+: 105mm 170: 56 Model 56A1; 114 Model
56/L 10A1 pack howitzer; 122mm 131: 57 Type-54/54-1
(M-30); 20 Type-83; 54 Type-96 (D-30), 130mm 62 Type-
59-1 (M-46)
MOR 472: 81mm 11 M29A1; 82mm 366 Type-53/87/M-31
(M-1937); 120mm 95 MO-120-AM-50 M67/UBM 52
AT
MSL • MANPATS 9K115-2 Metis M1 (AT-13 Saxhorn-2)
RCL 106mm 238 M40A1
IISS-2016, Pages-235,236
locally produced 240 mm MLRS
.
240 mm MLRS (Korea)
.
122 mm MLRS Type 81
.
122 mm MLRS Type 90B
.
locally produced 122 mm MLRS
.
SH 1 155 mm
.
Nora 155 mm
.
M 845P 155 mm
.
KH 179 155 mm
.
D 30-2 122 mm
IISS counted all these type of artillery you have shown here. 122m, 155mm, 240mm all. So it doesn't give any hint that your additional artillery count is in excess of what IISS already shown in their book.Check this out-
Myanmar artillery
ARTY 419+
SP 155mm 42: 30 NORA B-52; 12 SH-1
TOWED 264+: 105mm 132: 36 M-56; 96 M101; 122mm 100
D-30; 130mm 16 M-46; 140mm; 155mm 16 Soltam M-845P
MRL 33+: 107mm 30 Type-63; 122mm BM-21 (reported);
Type-81; 240mm 3+ M-1985 mod
MOR 80+: 82mm Type-53 (M-37); 120mm 80+: 80 Soltam;
Type-53 (M-1943)
AT
RCL 1,000+: 106mm M40A1; 84mm ε1,000 Carl Gustav
GUNS 84
SP 105mm 24 PTL-02 mod
TOWED 60: 57mm 6-pdr; 76.2mm 17-pdr
IISS-2016, Page-276